Great trip,, lots of islands to stop over on. Caper cats are wonderful stable cruisers. I sailed my cat Port Douglas to Cooktown 10 days ago. Downwind sailing over 30 knots at times. December winds can be very fickle so it could be a slow trip into N easteries.
My 3.5 hp outboard pushed my Caper cat well. I carry an EPIRB in my pocket with an inflatable waist stored life vest when I'm sailing alone. The standard Caper Cat rudders are quite adequate. They are very east to right after a capsize, if you have the ropes already tied underneath.
A jib pole to hold out the jib out for light downwind sailing is advisable, a piece of bamboo can work well.
Best of luck.