XRF doesn't seem "primitive" to me. The equipment costs $17,000. 0% of numismatic catalogs include elemental analysis as of 2021. I walked down 47th street with a fistful of dollars and no one would analyze coins for me. I agree Thermal Ionization Mass Spectrometry, which would get isotopes, would be interesting. I know David Hendin of the ANS has done work on the istopes of Judean coins. Do you know anyone who offers isotopic analysis of coins as a service? I have seen a few scattered papers on archeometallurgy coming out of universities that have both a physics department and archaeology department. What would impress me is a catalog of a small university coin collection with even elemental analysis of the entire corpus. Isotopic info would be a bonus.