Precut
plywood pieces to cover holes from collision (including blown in
ports and ripped off companionway hatch). Underwater curing
epoxy. Foam rubber balls of different sizes to put in holes. Long coarse thread self tapping screws. Strong
battery powered drill driver for screws. Collision mat
Stainless (or galvanized) wire and wire clamps for longest stay. Spare spreader and spreader
parts.
Equipment to climb
mast. Absolutely secure
halyard shackles. Stopper knots in bitter end of halyards and
sheets sewn with whipping twine so they can not come out without using knife.
Wear a harness and carry a knife at all times
Lots of chafing
gear
Expensive but worth it: Complete spare
autopilot.
Three ways to generate electricity (could be three separate
solar panels)
Besides the normal in first aid kit - a hemostatic clotting agent or bandage like Quikclot to stop severe bleeding.
Emergency
drinking water
Instead of more flares I'd get a
battery powered Laser Flare for night and for day orange smoke and a long floating
distress streamer that floats behind the boat and is visible from the air.
Two waterproof handheld VFH radios
Also get a 2nd
EPIRB (an inexpensive PLB is fine) in case the first fails.
Three anchors and ground tackle. (I realize this is a weight challenge on your boat)
Reinforce bow
cleats.
Have person knowledgeable with cat design inspect all cross beam connections and consider any possible reinforcement. Inspect
rudder gudgeons/pintles. Replace and/or reinforce.
Carl