I am sure you can make or buy one.
I have been trying to get my boat rigged all summer with a spinnaker and before I found an entire kit for sale extremly cheap I had a few ideas.
Buy the wave spinnaker kit, that takes care of the sail and pole and alot fo the rigging. Then send the sail off to a sail maker or maybe ask Hobie to do it, but you need snuffer patchs added to it, they help it fold up correctly into the snuffer.
As for the Hoop at the end of the pole, you could go look at some carbon fiber ones or something like that, or go to a garage sale and find an old tennis racket, take out the strings and anything sharp and there is your hoop.
Now just sew some kind of long bag that is open at the hoop and runs backwards the length of the pole and under the tramp a little ways. That should take care of the snuffer system.
Nacra 5.2 "Elsies"
Hobie 14T, "Blazin" I guess I am keeping her!