I was unable to find if they support TXXX comment frames in MP3, but saw patches that make me lean towards (partially) 'supported'.
I'm not sure how straightforward it would be to search through a library like that. You'd have to try it and see if you'd gain anything over your current setup.
It used to run OK in Wine, but it's admittedly been a while since I've tried it. It has been my music file renamer for years though.