I really like that idea Zuenda. I was thinking a sort of floating outrigger. So you could turn easily to either side. The weight of the engine and drive wheel holding it down.
All the old pics you see of those, the drives seem solid Mounted.
I was sure I had seen a Zündapp version some where but can't find it now. Zündapp - Wikipedia, the free encyclopedia
Would make reduction a snap. Could use a scooter drive wheel and almost any engine.