Ok, here it is.
Made a flat lens out of a piece of good plastic and the top part of a multivitamin container. Epoxied the two together and then attached to the GoPro housing with Plumbers Putty. Used enough connectors to get the camera above the downrigger ball. Connected a 3-way swivel via 35lb mono to the ball, 65lb braid to the first connector below the camera and the third to my imitation downrigger. The braid to camera connection remains loose unless the mono should break (kinda like an anchor connection). Should the ball become stuck, I can break the mono and pull from the camera connector. This may allow me to pull the unit out backwards, or at least pull the camera from the ball (only sticky tape holding mount on).