I plugged a thru hull on my sailboat that I thought I might want to reuse with a Groco thru hull with the combination thread and a bronze cap and sealant. Installed and forgot about it.
I don't see why you couldn't install what would basically be a 1/2" thick backing plate with not center hole drilled. Seal the raw fiberglass inside the hole in the hull copious epoxy. Seal the backing plate with 4200 and bolt it down. At worse, you will have a dimple in the hull that will either be hard to clean growth out of or it is ignored and allowed to fill in...
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