Is there any interest in this? I can see it opening up LOADS of possibilities with regards to playlist generation. It would actually put BeaTunes light years ahead of iTunes in what is possible through Matchlists vs. Smart Playlists...
FWIW, I do accomplish something like that by having a number smart playlists in iTunes that have the "source" tracks for a particular Matchlist. In the example above, the iTunes/Music smart playlist would be:
Genre is Hip-Hop
BPM is in the range 90 to 95
I go further in mine and ensure that only songs that are valid for iCloud playlists are listed, otherwise the resulting Matchlist might not sync via iCloud Music Library.
Likewise, I have the playlist exclude songs that are unchecked. That makes it easy to keep some songs out of Matchlists.