I had a similar experience after switching to DVORAK as a nerdy teenager, however I found by just leaving my smartphone on QWERTY, I'm able to switch and still type 40 - 50wpm with minimal practice on a real keyboard. I'm more like 100wpm on DVORAK.

Practicing both layouts a little may make it possible to keep both modes in your head, but I don't know if a completely different input mode would make this harder.