There's a recent trend of people designing custom keyboards for their own accessibility needs. So this is a random thought, no idea if it would work. A couple

There's a recent trend of people designing custom keyboards for their own accessibility needs. So this is a random thought, no idea if it would work. A couple of popular keyboard firmwares are open source. I'm thinking it could be possible to reject two neighbor keys which are struck within the same 10 millisecond window. IOW, if you're on a qwerty keyboard, if R and T are both hit at the same time, don't send the keystrokes to the computer. QMK and KMK are popular keyboard firmwares. QMK is C based, and KMK is CircuitPython based.