Learn Dvorak with Ten Thumbs Typing Tutor

I’ve been learning to touch type and I’ve reached that difficult stage, like growing out a perm, where I can no longer properly type with two fingers but I can only touch type at 20 words per minute. It occured to me that maybe I should have learned to touch type using a Dvorak keyboard layout since that wouldn’t have affacted my two-finger typing so much. Maybe it’s not too late to switch now.