You can install Python on Windows to run the .py script. The ‘other shell script’ would probably run using bash, which is also available for Windows.
However, if you set
preferences > processing > auto-apply chromatic adaptation defaults = modern
then the presets won’t be used: the white balance module will use the fixed camera reference value, and color calibration will be used to adjust white balance. See:
https://docs.darktable.org/usermanual/3.8/en/module-reference/processing-modules/color-calibration/
You’ll find videos on YouTube; these are from the module’s author:
