You can buy pre-skinned nidacore which has white resin- it looks like gel coat. I think I got mine from LBI.
If you cut it 1" larger than the hole on one skin, and just undersized for the hole on the other, you could pop the excess nidacore off and bond those in. Instant flanged nidacore "plugs". Maybe use 5200 or "water weld" epoxy putty.
It won't be as perfect as being glassed over, but it might look ok.
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