You mean like a torque converter? That might help, but there's no room for that. A few of the two strokes use "slipper clutches" to help with the gearbox resonance.
I think that's what it is. In helicopters (anywhere starting at 180hp to over 1000hp, what I saw so far.... this is a rather small unit). Basically the same as in older style bicycle rear hubs.
Ramps getting loaded with roller needles one direction, free to turn the other....
These units are rather small,especially at the power requirements you have. You should be able to incorporate this into the flywheel or PSRU adapter - Of the guard i wouldn't know whether it would be better to have the flywheel inertia on the engine-side or the PSRU-side of the freewheel-unit....?! If you care for going with such a unit, I try to think about it :))
By the time the Mazda-1-rotor is smooth and idles well, it probably will cost the same as a small re-engineered 2- or 3-rotor. You mentioned Alu-side housings - as the price is now, these already buy a whole 40-hp engine..... unless Mazda goes Alu at some point....
Nevertheless, keep hacking on it!!
This is one of those projects I'm doing just because I want to. It's clear that it may never become anything worth using, but it's an interesting exercise nonetheless. With any luck, it will keep me busy until someone makes an ideal engine :-)
Hey, never say never! You might stumble on something, no one has thought about yet.
IF you get it light, low idle and smooth you are the man! Even if you don't want to go into production, someone else most certainly would - the market (LSA) is there!
Besides it IS a interesting project at an affordable budget (I hope to get there someday, .....:))