The Nacra 5.0 doesn't have a fully battened jib, so the Hobie batten hinge things won't do anything for you.

If your main problem is the jib sheets getting caught while tacking (on my boat it was usually under the mast base), there are simpler solutions. On Nacra 5.8s people usually run a small diameter bungee from one bridle tang, around the bottom of the diamond wires to the other bridle tang. That will keep the jib sheet up and clear from things it can hangup on. I think that trick will work with the 5.0, but you might have to get creative.

I recently added a self-tacker to my 5.8. It was simple to do, but cost about $400 in parts, not to mention getting a jib that was cut properly for it.