The Gemini Yahoo group is fairly active. If you have not already done so, I would suggest asking there.
I like the tack track scheme on the Gemini screecher. According to a Bay Area sailor I talked to who has one, it works quite well and lets you go deep without a pole.
Here is a link to an article about a screecher upgrade to a home built Richard Woods design. The boat
is a bit smaller and much lighter than yours, but you might find the information useful.
Adding a Screecher to Your Catamaran
In the end, it probably comes down to the wind
in your planned sailing grounds.