Dvorak for thumb typing?

Makes as much sense as QWERTY for thumb typing. In either case you're not touch-typing, so the only advantage is visual familiarity of layout. (As a Dvorak user, I prefer desktop keyboards in which it's possible to pry off and rearrange the keycaps to match.)

> As a Dvorak user, I prefer desktop keyboards in which it's possible to pry off and rearrange the keycaps to match

There are keyboards with no printed letters on them whatsoever. That's even better :)

Gotta flex them thumbs in alternating rhythm, you know.