My understanding is that a Hooter is designed as a reaching/mild downwind sail, that can also be used a bit above a beam reach in very light wind. A genoa off an appropriate sized monohull (not sure what that would be) that was originally designed to furl would be workable, certainly giving you more sail area in the light stuff.
Be careful about attaching your hooter halyard above the hounds more than 1/3 the distance between the hounds to the top of the mast. I needed a 2 to 1 purchase on the halyard to get enough luff tension for the sail to set well and fulr properly. And furl early! The most trouble I had/have with them, is to get them rolled up cleanly once I'm overpowered.
I've bought 2 lightly used hooters off these classifieds over the years both for $800 or less, and one included the furler and upper swivel. I've used aluminum windsurfing masts for poles on and TheMightyHobie18 and a Reynolds 21 with good success, just limit length to about 12.5', and cutoff the tip and have a substantial cap made (alum or ss) that can transfer the loads to the pole without crushing or tearing it.
And yeah, that's good advice about the drysuits!

Dave