this sounds like one of those things that are all very well as far as they go, but don't provide anything you can't achieve more easily by another combination of parts.
I see this with my JAP and Jawa engines, both were in production in various forms over long periods of time with various formats. There are a small number of variations which are worth doing for very specific reasons, several which are possible ways of using parts to hand to no real benefit but nothing lost either, and quite a few which are a lot of work for no useful reason
would it not be simpler to mount an Evo engine in a Shovel frame? Just asking, I've never seen one which makes me think that perhaps it isn't worthwhile
Shoot, a man could have a good weekend in Dallas with all that stuff...