If you can not moore the cat off the beach (anchor with a float), or back it up to the beach...and fly up the beach.. you are not in total control your boat!
If you do a beach landing.... how do you avoid people on the beach (or worse how about a little kid that runs into the surf and in your way!) ?
This sounds like a disaster waiting to happen on a beach like Myrtle.
I seem to recall reading that you can launch anywhere in NC without licensing or problems... you should move to an area where there are no swimmers!!!!
All that being said.. if you wont move to a more friendly "catamaran beach"... i think a weta is a great choice.. you have room for 2 bikini' chicks, and a reacher that you can easily furl. it is a very resilient design (i think roto-mold hulls and ama's) and has carbon and lightweight features. Despite being short (14' if i recall) they are pitch resistant...