here comes a know-it-all answer, at least I think it could be done this way. Could you have "blocks" made that would press out the tag you need? I picture two pieces, one with a negative relief and one that has a postive above the large flat area. Use a hammer or hydraulic press to make your tags. My lathe has a "milling attachment" that I envision would make those blocks. Just a thought. Tune back in for more ideas, I've got alot of them.