Typing in VR is a hard problem to solve! Good on you for tackling it. This reminds me of a 'drumstick' typing experiments that Google did a few years back, type by playing a xylophone basically. Maybe you've already seen it, but here's an example that your work reminded me of:
Viewing post in Typing At Sea: A UI Experiment jam comments
Thanks! Yeah, there has been a hand full of drumming style keyboards that have come out bet never caught on. I was trying to see if something larger that would encourage larger arm movements/swinging would feel more satisfying. It felt good, but was a little hit and miss. I tried putting some keys further away too which helped....but I learned that for a large keyboard, the narrow field of view of the Quest was a bit of a hindrance.
For another experiment, I'm considering having the keys come at you, spawning in on a loop, Beatsaber-style. That would solve the narrow field of view issue.