I think you can prevent additional issue of coins by checking the coin serial number is within a valid range - this can be known by the wallet and also recorded in an immutable field of the coin.
You can also prevent duplicate coins being created by ensuring two coin can’t have the same serial number (because they would share the same SD address).
Looks like a great App Dev opportunity - develop the do it yourself Omni/Coinprism app for SAFEnetwork. Massive!