Interesting.... I guess I'm extremely simple. In many Bansner stocks I've finished using flip flop recoil pads I've simply covered the foam with clear 5 min epoxy/glue and glued the pad to it. I put it butt end up in a vice, place a flat object on the pad, then a 5 lb weight on the flat object while it dries. I tape off the stock for any glue overflow and wipe it before it hardens. Very light and I've never had one come loose. On these I've been looking to make them as light as possible and have no desire to take the pad off unless I wish to replace it (cut/sand). If I wanted the option of removing the pad from time to time it wouldn't be a good method but for light weight it works well.
