Sounds like a good race to do on the idea for a F12 I have. With the unstayed mast where the mast is build up of loose sections of alu tube interlocking. You can easily take the mast down even when on the water this way. When push comes to shoove you can remove the middle section as sail reefed that way where you only need 4.5 mtr clearance under a bridge (= 15 feet)

A 65 kg cat would paddle really fast as well, Just take a kayak "paddle" with you and you're very good to go.

Wouter