That's why I got a Dvorak skin for my TypeMatrix keyboard. I know QWERTY well enough I don't have to look for it, and I can switch to Dvorak and be able to peek if need be.
I've been using dvorak for a long time. I kind of wonder if not having a keyboard with the correct dvorak keycaps actually helps learn it faster than it would if you had the correct keycaps? If you can't look at the keys to know what they are, then it encourages touch typing. Still, I can see where it'd be nice to be able to fall back on looking at the keys.