I would opine that beachcats and the like might "fit" better with a small sportboat regatta rather than a larger mono/multi event (like boats over 30').
Smaller sportboats are in a similar pricerange and you might find more potential converts (fewer crew requirements, higher performance, etc) than the big boat teams?
CRW has M24s and J70s out the wazoo but I suppose you are talking about smaller sport boats like 49er, 29er, etc.?
I think it would be great to have an F18 fleet at CRW (and I have a free place to stay! ;-)) but I just don't know how they fit us in that bay without sending us up the river or off a beach (which would defeat the purpose to be so far away from everyone else).
I don't mind monohull crowding. I think it's still good to mix it up with them - otherwise, they don't notice we're there. There will be some tension at marks but, ehh, there's tension anyway. I think it would be interesting to use the Spring Fever style start line with separate start and finish lines below and above the course respectively. If you're careful with the starts, I think it could still work.
My favorite is while sailing on a mixed course, I was sailing my a-cat and approaching A-mark on the wire. An MC scow sailor was coming in at the mark wide (well overstood giving me plenty of overlap). He apparently never saw me and turned down hard into me driving me into the mark. Of course I gave him the protest hail. His reply? "Well if you weren't so f(*&#$ing fast this wouldn't have happened!". He bought an a-cat a year later.
