I suppose it depends on whether you want a hard strike or a softer strike that works like a plunger would..... i think using hard ladigo leather or soft leather would work just fine as long as you are not hunting in the rain a lot.
If you are a rain hunter i think i would recommend using a piece of plastic under your finish strike material. whether that be seal skin, leather, or velcro, you could still change it out without going through the whole build up process.
I've got all kinds of scrap phenolic here i use for tip overlays that would work excellent. Let me know if that's something you are interested in and i'll send you some.... Kirk