I've thought about it. I think a pto shaft coupler would be ideal to hook the engine up. Maybe have the engine setup on a larger baseplate that takes a couple larger bolts further away from the base for ease of snugging them down. Each piece of equipment would have to have a bearing supported input shaft though, so it'd be an assache in that regard. But you would forego the assache of having 100 small engines to keep running and could just quick swap one to many different applications.