Certainly if the reeds are set up right, they should cut fuel reversion at low speed, and have very little effect at high speed. Two-stroke 500cc GP bikes were making 360 hp/L towards the end, so the reeds weren't hurting performance. 906's for the street.....hmmm...

Fly in the ointment?
 

After chewing on the is over lunch (insert rimshot here), I think the big problem will be the obstruction. To get maximum effectiveness, you need the reeds as close to the signal as possible. For a smoker, this is easy since the intake is just a hole in the cylinder wall. Reed blocks are not small items and even with what yamaha provided we were hogging out metal to stuff larger ones in. Compared to a 4-stroke there is plenty of room for them with a two-stroke.

I'm just guessing that it could be done nicely based on the porsche head design but it would require a serious redesign on the intake side of things. Most two stroke ports are square-ish with rounded corners and roofs to squeeze the rings into position again, so matching to a square reed cage is pretty obvious. Matching back to a round valve would be more interesting.

RZs are 175cc per cylinder and suck on every stroke so double that number then go with a larger 6 petal block... My street RZ spins shifts at 11.5k and runs 36 mm carbs. It would be close enough to try methinks (other than the head redesign).

tadd