For a little while we've been using Shrinkray (github.com/DRMacIver/shrinkr…) for these purposes, and I'm astonished it's not better known. It seems to improve on the older reducers in every way!
Link
GitHub - DRMacIver/shrinkray: Shrinkray is a modern multi-format test-case reducer
Shrinkray is a modern multi-format test-case reducer - DRMacIver/shrinkray
github.com