Quick action throttles tend to pull a lot of cable per degree of rotation, so might be a bit aggressive on a "Thou"?...Perfectly fine on a track bike but a rd bike needs a bit more throttle finesse.
Apparently an R6 throttle tube has a larger cable drum, hence pulls more cable than a standard Gen 1 "Thou" throttle tube, not as aggressive as a full on quick action but better than a "Thou" (apparently) ?
I'm considering getting one for mine.
Not sure if throttle housing will need some mods but it's been done before so i guess all the info is on web somewhere.
Cheap enough new, loads on Fleabay.
Rgds
Gaz