I fully realize that this is often done by using a "chip mod" that also allows the use of backups. I do not want to do that.

I have a specific customer, who runs a specialty import game software/old games store. He wants to know if I can do what I've done for his saturns (switched region mod) for a Playstation.

When I do a Google, I get buried in a torrent of modchip info. Is there a way? Even a chipped way that does not allow the use of backups?

I'm looking for a non game shark, permanent hardware modification solution. Any help is appreciated, even if it means confirmation that it isn't possible.