Fyberskin would be OK. The Customs people would inspect the wood for borers here, but if free they would be allowed through. I have brought in wooden items before and had no problems following declaration.

The Customs dogs here are very very good and they are on a treat incentive for every case they find declarable goods in.

In fact the dogs were onto my drum case before I realised it...and no they did not sit down with paws over ears and howl...