Hi Michael
You then expected already an answer in this direction. Sorry, no way to use a sloop rig. I have no clue how to support the mast.
The roller furler I would make by myself. Top swivels are not expensive. The drums are easy to make. Do not use Aluminum proviles. They are heavy and unreliable
There is a lot of information on the Internet to build them by yourself.?
The information using Keflar in this way is mixed. I can give you no advice in this direction. In any case double the glass fiber on the bottom.
Cheers
Bernd
Bernd Kohler