diff --git a/.github/workflows/test-sdist-linux.yml b/.github/workflows/test-sdist-linux.yml
index 42262a8aa29..f0f64492f2d 100644
--- a/.github/workflows/test-sdist-linux.yml
+++ b/.github/workflows/test-sdist-linux.yml
@@ -11,17 +11,35 @@ on:
       cuda-version:
         required: true
         type: string
+      build-pathfinder:
+        required: false
+        default: true
+        type: boolean
+      build-bindings:
+        required: false
+        default: true
+        type: boolean
+      build-core:
+        required: false
+        default: true
+        type: boolean
+      build-python:
+        required: false
+        default: true
+        type: boolean
 
 defaults:
   run:
     shell: bash --noprofile --norc -xeuo pipefail {0}
 
 permissions:
+  actions: read  # This is required for actions/download-artifact
   contents: read  # This is required for actions/checkout
 
 jobs:
   test-sdist:
     name: Test sdist builds
+    if: ${{ inputs.build-pathfinder || inputs.build-bindings || inputs.build-core || inputs.build-python }}
     timeout-minutes: 60
     runs-on: linux-amd64-cpu8
     steps:
@@ -43,16 +61,26 @@ jobs:
 
       # Pure Python packages -- no CTK needed.
       - name: Build cuda.pathfinder sdist and wheel-from-sdist
+        if: ${{ inputs.build-pathfinder }}
         run: |
           python -m build --sdist cuda_pathfinder/
           pip wheel --no-deps --wheel-dir cuda_pathfinder/dist cuda_pathfinder/dist/*.tar.gz
 
       - name: Build cuda-python sdist and wheel-from-sdist
+        if: ${{ inputs.build-python }}
         run: |
           python -m build --sdist cuda_python/
           pip wheel --no-deps --wheel-dir cuda_python/dist cuda_python/dist/*.tar.gz
 
+      - name: Download cuda.pathfinder wheel
+        if: ${{ !inputs.build-pathfinder && (inputs.build-bindings || inputs.build-core) }}
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cuda-pathfinder-wheel
+          path: cuda_pathfinder/dist
+
       - name: Constrain builds to the local cuda.pathfinder wheel
+        if: ${{ inputs.build-bindings }}
         run: |
           pathfinder_wheels=(cuda_pathfinder/dist/cuda_pathfinder-*.whl)
           test "${#pathfinder_wheels[@]}" -eq 1
@@ -65,12 +93,14 @@ jobs:
       # The env vars ACTIONS_CACHE_SERVICE_V2, ACTIONS_RESULTS_URL, and ACTIONS_RUNTIME_TOKEN
       # are exposed by this action.
       - name: Enable sccache
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: mozilla-actions/sccache-action@9e7fa8a12102821edf02ca5dbea1acd0f89a2696  # 0.0.10
         with:
           disable_annotations: 'true'
 
       # xref: https://github.com/orgs/community/discussions/42856#discussioncomment-7678867
       - name: Adding additional GHA cache-related env vars
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: actions/github-script@v9
         with:
           script: |
@@ -78,12 +108,14 @@ jobs:
             core.exportVariable('ACTIONS_RUNTIME_URL', process.env['ACTIONS_RUNTIME_URL'])
 
       - name: Setup proxy cache
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: nv-gha-runners/setup-proxy-cache@main
         continue-on-error: true
         with:
           enable-apt: true
 
       - name: Set up mini CTK
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: ./.github/actions/fetch_ctk
         continue-on-error: false
         with:
@@ -93,6 +125,7 @@ jobs:
       # cuda_bindings/setup.py parses CUDA headers at import time, so CUDA_PATH
       # (set by fetch_ctk) must be available for both sdist and wheel builds.
       - name: Build cuda.bindings sdist and wheel-from-sdist
+        if: ${{ inputs.build-bindings }}
         run: |
           export CUDA_PYTHON_PARALLEL_LEVEL=$(nproc)
           export CC="sccache cc"
@@ -102,7 +135,15 @@ jobs:
           python -m build --sdist cuda_bindings/
           pip wheel --no-deps --wheel-dir cuda_bindings/dist cuda_bindings/dist/*.tar.gz
 
+      - name: Download cuda.bindings wheel
+        if: ${{ !inputs.build-bindings && inputs.build-core }}
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cuda-bindings-python312-cuda${{ inputs.cuda-version }}-${{ inputs.host-platform }}-${{ github.sha }}
+          path: cuda_bindings/dist
+
       - name: Constrain cuda.core to the local cuda.bindings wheel
+        if: ${{ inputs.build-core }}
         run: |
           CUDA_MAJOR="$(echo '${{ inputs.cuda-version }}' | cut -d. -f1)"
           pathfinder_wheels=(cuda_pathfinder/dist/cuda_pathfinder-*.whl)
@@ -123,6 +164,7 @@ jobs:
       # wheel-from-sdist needs CTK and cuda-bindings (dynamic build dep via
       # get_requires_for_build_wheel in build_hooks.py).
       - name: Build cuda.core sdist and wheel-from-sdist
+        if: ${{ inputs.build-core }}
         run: |
           export CUDA_PYTHON_PARALLEL_LEVEL=$(nproc)
           export CUDA_CORE_BUILD_MAJOR="$(echo '${{ inputs.cuda-version }}' | cut -d. -f1)"
@@ -134,5 +176,5 @@ jobs:
           pip wheel --no-deps --wheel-dir cuda_core/dist cuda_core/dist/*.tar.gz
 
       - name: Show sccache stats
-        if: always()
+        if: ${{ always() && (inputs.build-bindings || inputs.build-core) }}
         run: sccache --show-stats
diff --git a/.github/workflows/test-sdist-windows.yml b/.github/workflows/test-sdist-windows.yml
index eb4e25b5fc5..5451d20429e 100644
--- a/.github/workflows/test-sdist-windows.yml
+++ b/.github/workflows/test-sdist-windows.yml
@@ -17,17 +17,35 @@ on:
       cuda-version:
         required: true
         type: string
+      build-pathfinder:
+        required: false
+        default: true
+        type: boolean
+      build-bindings:
+        required: false
+        default: true
+        type: boolean
+      build-core:
+        required: false
+        default: true
+        type: boolean
+      build-python:
+        required: false
+        default: true
+        type: boolean
 
 defaults:
   run:
     shell: bash --noprofile --norc -xeuo pipefail {0}
 
 permissions:
+  actions: read  # This is required for actions/download-artifact
   contents: read  # This is required for actions/checkout
 
 jobs:
   test-sdist:
     name: Test sdist builds
+    if: ${{ inputs.build-pathfinder || inputs.build-bindings || inputs.build-core || inputs.build-python }}
     timeout-minutes: 60
     runs-on: windows-2022
     steps:
@@ -45,6 +63,7 @@ jobs:
           python-version: "3.12"
 
       - name: Set up MSVC
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: step-security/msvc-dev-cmd@22c98154b708dbd743e6f27a933cf6ceba3305c4  # v1.13.1
 
       - name: Install build tools
@@ -52,16 +71,26 @@ jobs:
 
       # Pure Python packages -- no CTK needed.
       - name: Build cuda.pathfinder sdist and wheel-from-sdist
+        if: ${{ inputs.build-pathfinder }}
         run: |
           python -m build --sdist cuda_pathfinder/
           pip wheel --no-deps --wheel-dir cuda_pathfinder/dist cuda_pathfinder/dist/*.tar.gz
 
       - name: Build cuda-python sdist and wheel-from-sdist
+        if: ${{ inputs.build-python }}
         run: |
           python -m build --sdist cuda_python/
           pip wheel --no-deps --wheel-dir cuda_python/dist cuda_python/dist/*.tar.gz
 
+      - name: Download cuda.pathfinder wheel
+        if: ${{ !inputs.build-pathfinder && (inputs.build-bindings || inputs.build-core) }}
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cuda-pathfinder-wheel
+          path: cuda_pathfinder/dist
+
       - name: Constrain builds to the local cuda.pathfinder wheel
+        if: ${{ inputs.build-bindings }}
         run: |
           pathfinder_wheels=(cuda_pathfinder/dist/cuda_pathfinder-*.whl)
           test "${#pathfinder_wheels[@]}" -eq 1
@@ -74,6 +103,7 @@ jobs:
       # smoke test, not a production build; see build-wheel.yml which also
       # limits sccache to Linux).
       - name: Set up mini CTK
+        if: ${{ inputs.build-bindings || inputs.build-core }}
         uses: ./.github/actions/fetch_ctk
         continue-on-error: false
         with:
@@ -85,6 +115,7 @@ jobs:
       # Constraint paths are passed as native Windows paths because the pip
       # subprocesses run outside Git Bash.
       - name: Build cuda.bindings sdist and wheel-from-sdist
+        if: ${{ inputs.build-bindings }}
         run: |
           export CUDA_PYTHON_PARALLEL_LEVEL=$(nproc)
           export PIP_BUILD_CONSTRAINT="$(cygpath -w "$(pwd)/wheel-constraints/cuda-bindings.txt")"
@@ -92,7 +123,15 @@ jobs:
           python -m build --sdist cuda_bindings/
           pip wheel --no-deps --wheel-dir cuda_bindings/dist cuda_bindings/dist/*.tar.gz
 
+      - name: Download cuda.bindings wheel
+        if: ${{ !inputs.build-bindings && inputs.build-core }}
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cuda-bindings-python312-cuda${{ inputs.cuda-version }}-${{ inputs.host-platform }}-${{ github.sha }}
+          path: cuda_bindings/dist
+
       - name: Constrain cuda.core to the local cuda.bindings wheel
+        if: ${{ inputs.build-core }}
         run: |
           CUDA_MAJOR="$(echo '${{ inputs.cuda-version }}' | cut -d. -f1)"
           pathfinder_wheels=(cuda_pathfinder/dist/cuda_pathfinder-*.whl)
@@ -113,6 +152,7 @@ jobs:
       # wheel-from-sdist needs CTK and cuda-bindings (dynamic build dep via
       # get_requires_for_build_wheel in build_hooks.py).
       - name: Build cuda.core sdist and wheel-from-sdist
+        if: ${{ inputs.build-core }}
         run: |
           export CUDA_PYTHON_PARALLEL_LEVEL=$(nproc)
           export CUDA_CORE_BUILD_MAJOR="$(echo '${{ inputs.cuda-version }}' | cut -d. -f1)"