I would definitely loose the rotary term, not to be a bugga but its not a matter of what "is" the correct term, your business needs customer and the least amount of confusion the better. people look at it and see a radial regardless of the inside workings.
I can't wait to see your engine up and running on diesel, an exact release date would be good, I'll even get all my fly buddies down for a fly in BBQ for you to show your work.
everyone wants you to succeed, its just that there have been so many flops in the past.
In Russia Vedenyev use their radial engines to power generators, recreational aviation is too small a market, if you hooked your engine up to a stationary generator you would expand your business ten fold. Vedenyev engines run up to 20,000 hours as stationary generators, and thats good advertising.
If your engine is more efficent than the others it will naturally be bought as a generator.
Cater for the masses and have your nich as well, like how honda has their F1 and their family cars.