Hey Drew-
I recall a mistake I made with a former female sailing friend/fiance about cat sailing...I assumed she liked/loved the sport and wasn't tolerating it for my sake. I'm positive??? this isn't the case for you. Either way before you buy something you might ask...
As far as wings for an SC20; you better consult Tom Haberman about how to do it properly. I almost bought a SC20 with wings but went to the ARC22 instead. The beams showed some wear around the installation holes. If you decide to go with wings; the 12'ft beam of the SC20 would end up around 15-16' approx. This will increase the righting moment issue and may possibly require reinforcement in some areas. Haberman can help you with that as well. Roberts put wings on his RC30.
fair winds,
thom