Sounds interesting.
TBH, "multitouch" is a a bit over-rated, very HW dependant and can be less intuitive. If basic single touch is good, then that would be fine.
I had to look up "KSM". Here is
a thread on KSM 9
I think I'd want a 2nd working H2O, as I use my H2O too much to read stuff and proof my own writing.