Make geocoins of high quality materials is very attractive -in fact I like your coins by this, and by the artistic expression-, very interesting the techniques of which you speak, very fine, ...however, in this way, it will be more expensive for the designer, and also for the final buyer, or not?
Make geocoins of noble metals and precious stones, fine jewelry with track number ...is an idea worthy of careful consideration. But is not accessible to most people, I think.