The US issued currency during WWII with that explicit plan-- notes counterstamped "HAWAII" in huge letters, or with different colour seals. If Hawaii fell, or

The US issued currency during WWII with that explicit plan-- notes counterstamped "HAWAII" in huge letters, or with different colour seals. If Hawaii fell, or a large stash of notes intended for overseas use were diverted, they could easily demonetize them. The reason it's not done on a more precise level is probably a UX issue-- you can easily remember "The $10 notes with yellow seals are void" but roadcasting and getting understanding of thousands of "$10 note Series 2024 serial number QL34567846A is void" is infeasible.