This is a clever work around. I can understand preserving the original paint and therefore creating these new cable stops. I don't see any reason why it would not work. Epoxy should hold and the screws will cinch it down until the epoxy cross links. You may want to use a clamp or near the cable stops too just to make sure that you have a uniform thickness of epoxy across the joint. You probably thought of that already though.

Keep the pictures coming.