That's going to be a tough one!
One thing that comes to mind, and not sure if it would even be feasible, would be replacing the wood lip with metal epoxied to the wood. You'd have to relieve the wood to accommodate the metal and depending on thickness required it could be a real pain to get formed to fit. The other question would be if it will show or not once reassembled onto the gun - though if it would be you could use steel and blue it so it doesn't stick out like a sore thumb. Might be able to do the same with wood, but that would be a lot of hand carving since I'm sure it's more oval shaped than round.
Might be able to do something similar with three or four small metal pins that could be used to locate and prevent the forearm from rotating (thinking 3, 5, 7, 9 o'clock positions).Just sand/cut the face of the forearm flush then drill the four small holes where needed and epoxy in the pins so they protrude the correct amount.
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