What about say OZ armourers using brass of aluminum pads? Not as issued maybe but a field repair. ( I can hear Peter choking on his scotch now.)
I have done 2 sets of repairs myself and I used brass pads with brass screws, but they are range guns and no one cares for club shoots. You could of course make them out of a hard wood and I think some were. The advantage of pads is you can shim them to get the barrel spot on along its groove. Now if you are good and I mean very good at woodworking OK, I tried Peter's wood way and gave up simply shimming them as its a very complex 3d thing..
Looking at the rules it doesnt say anything about using specific glues So I would use Epoxy myself for its durability.