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It would be good to see what is going on inside the boat. If those are chainplates then it seems like you would want more than a backing plate on the inside, something needs to transfer the load into the boat's hull or bulkhead. The deck typically can't handle that sort of load.
This is a very similar product that is already made:
Tow Pad Eye
This is the style of backing plate/chainplate that I would expect for rigging loads. It attachs to a deck mounted padeye like the one shown, but transfers all of the load from the deck to a bulkhead:
My boat uses something like that under the backstay padeyes to transfer load from the deck to the transom.
This is a very similar product that is already made:
Tow Pad Eye
This is the style of backing plate/chainplate that I would expect for rigging loads. It attachs to a deck mounted padeye like the one shown, but transfers all of the load from the deck to a bulkhead:

My boat uses something like that under the backstay padeyes to transfer load from the deck to the transom.