The jib on the 5.2 is overlapping, this means you cannot make it self-tacking without some major recut: it would probably be better to get a new jib.

A roller will also require a new or recut jib. Keep in mind also that you have to remove the jib from the roller everytime you sail or at least have a good cover for it. Do not leave your rolled sail with the boat parked, it's going to unroll, flap around, and self destroy itself.

Frankly, I'd get rid of the jib, reduce the rake, and replace the main with a more modern square top one. Chip from Whirlwind sail can probably ship a new main to you at a reasonable cost as long as you can source battens locally. Compared to the cost of the furler/self tacker and associated parts, it may end up to be cheaper to get a new main...