If you have RSI, you would probably be better served by a bowl keyboard like a kinesis or a maltron; or, at least, a split keyboard like an ergodox.
As for holding in your lap, the cord on mine (kinesis advantage) is long enough that I can comfortably take it off my desk and put it in my lap. YMMV, of course, depending on how you have your desktop set up, but I doubt that's an insurmountable problem.
I tried the "you don't have to bottom out" approach on several mech keyboards with blue switches, but never really felt it. I still had to consciously wait for it to register the click, while normally I'd be over the next key already.