I’ve just ran the excellent BFD Metadata editor and am pleased to say it still works.
I’m not even sure it can still be got as I can’t see a download at githut (a very confusing site) but I can upload the windows version for anyone who wants it.
You have to point it to the new database location which for windows users is;
C:\Users\purti\AppData\Roaming\BFD Drums\BFD3\Programs.database (YOU being your user account)
Then you can edit preset, kit and kit piece names as you wish.