Can you post a picture? On my 1974 Catalina 22 the female clip was simply held in place with three small screws and the wire came up through a 3/8s dia hole in the center of the clip. A piece of wood (perpendicular to the mast support post) hid the wire in the cabin.
Without seeing your situation, here is a thought, grind out the old fiberglass until the coupler is free. then epoxy the new area, sand and paint, then properly install the new coupler.