How about cutting a flat surface on the grip, say 10mm in. Then epoxy glue a nice slab of similar looking timber on it well oversized. Then shape it to fit.
Ive done this in the past to a few rifles. I went through a bit of a mini14 stage (oh the embarrassment) and they all needed comb and grip enhancements to make them even remotely ergonomical.
Kj
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