Scott, I don't think it's wise to try and sail through the inlet, although I'm sure it's possible, timing would be everything.
There isn't a local Hobie Fleet in the Sebastian area. The old Fleet 45, now an open fleet has regular races and socials, but we are about 30 miles north of you.
I don't know if the IRCA fleet meets regularly or not, they are also an open fleet, and a good group of people.
Check out the http://www.1design.net
set for local happenings.