I have read some post on The HullTruth about some guys injecting Gorilla Glue in wood cores and stiffening them up with good results. Good thing is u do not need to dry out the wood, GG actually works better with damp wood. You could do it all from the top and then cover with Kiwi Grip in a mild nonskid.
Worst case, does not work, look like crap, you could still cut it out
YouTube might have something on this
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