An alternative one-handed keyboard design I like is the half keyboard by Edgar Matias. Personally I am not sure which one is better for typing half-dvorak or half-qwerty.
http://edgarmatias.com/papers/hci96/ https://www.autohotkey.com/board/topic/1257-half-qwerty-one-...
I used autohotkey for about half a year when I injured my shoulder. With the time to practice I got most of the way back to my typing speed with one hand. It’s really a viable solution that wasn’t too hard to learn.
It's not wearable though, no? or is it?