This would be wonderful...I've got happ rotary on my 4-player CP, on the outer positions, but would love to be able to play rotary front and center, but still have Sanwa style sticks for fighters and such...I just like how they feel versus the Happ.
The main issue I have with the happs, as far as the sticks are concerned is they are tight, and the bat top doesn't provide much leverage for spinning...sure, I can grip harder, but it doesn't feel as natural. Not sure how to deal with that, and keep the feel consistent, but I've often pondered some sort of shell with rubber or something on the inside that one could clamp on. That would make me incredibly happy.