pennies are good for quite a while.
why not just run them every X years?
I still haven’t seen any nickels or dimes from 2024. They usually turn up in March or April of the issue year.
Collectors would go nuts. U. S. coins from 1965-67 were minted at all US mints...San Fran, Denver, Philly, West Point...without mintmarks, to minimize the number that would be removed from circulation by collectors. Things were a little crazy when silver was removed from the coinage. The Mint should be turning a tidy profit from coins minted in San Fransisco, these days.
Just make new pennies every 10 years.
Problem's solved.