I'd love to see a progression of typing speed over time.
That's the real test.
I believe this idea can have potential for breaking the world record because there is no finger-to-key travel. But maybe it is diminished by the having to press a key multiple times over to get to the target just like in old cellphones [0].
Alternatively maybe one could brute force the problem of optimal keyboard layout/etc using simulations. Like that robot (human) hand that solves rubik's cubes by learning through simulation (apparently, from OpenAI [1]).
[0] https://upload.wikimedia.org/wikipedia/commons/7/73/Telephon...