Re Kicker. If the tabernacle and mast are arranged in the same way as a P21 - A wichard type u bolt and two extra nuts should fit the damaged holes, with just enough clearance between the mast and the tabernacle for the protruding threads of the u bolt and enough thread exposed on the shank of the threads to tighten it in place.
Suggest avoiding welding in situ perhaps as hot particles find their way onto the gel coat.
Lindsey P21/75