If you can make multiple distinguishable buzzers — at least 3 vertically, preferably 4, preferably left vs right vs both (i.e. 8 total, or 4 if you can make a buzzer feel clearly tri-state "sided") — this might be usable as a braille display.
See e.g. my post in the two handed thread here for the input part of it https://forum.tekgear.com/t/two-twiddlers-at-once/332
I'd be willing to beta test it if you can supply the hardware. Can do basic soldering & multimeter at home, but I don't have any more advanced kit like breadboards, 3D printers, and such.