"I type on a Dvorak keyboard instead of QWERTY" ... Wow, didn't it existed. Do you still use Dvorak ? (wondering if its worth the switch)
I use Dvorak, I believe it helped with my hand and wrist RSI issues, but I have no more than anecdotal evidence. I also type faster, which is verifiable, but it might just be due to ~7 years extra practice.
Keyboard layout shootout: qwerty vs dvorak(s) vs colemak