A friend has run Ellison's on acro a/c in the past, and they do work. But the Ellison, and the Bendix style a/c systems are somewhat and extremely pricey, respectively, and both are pretty hard to 'flow match' to individual combustion chambers. The reason I cross-posted that paragraph is that it *might* have the potential to be 'tuned' more tightly than mechanical injection, and allow a very low power electron system (think something similar to a lawnmower flywheel alt; much smaller than the motorcycle alt that Ernest was running. That would relegate the battery/alternator to backup duty for the engine.
SDS now has a system for Lycs with individually tunable cylinder injectors, and early testing has been really impressive on the efficiency front. But again, somewhat pricey, and he doesn't seem interested in setting them up for rotaries.
None of the above will be relevant, though, until the mudboat guys and cart racers start releasing chips and programmers for it.
Charlie