It has an airfoil tail group and the stab is mounted about 6 inches in front of the vertical fin. I'd just use brass tubing to "fill in" the airfoil and make a sort of tunnel for the wire... I'd then use thick CA to hold the fishing wire with cleaves for the top. I'd use an aluminum tube for the bottom and just attach the stab to the fuse.

I would attach the aluminum tube with an eye bolt through a brass tube to the stab and use the top of the eye bolt to attach a clevis which the fishing line would attach to.