you need donor info from the target region, so i would need a JPN secureinfo_A to copy to my EU console to make it register as a JPN console
because the secureinfo checks aren't patched by gateway i cant just edit mine to say its JPN as that breaks the signature, i need a legit signed secureinfo_A from a JPN console.
if/when gateway disable these checks in gateway mode they could probably just add a menu option on their launcher to enable region changing by just changing your systems region flag automatically, but for changing sysnand's region you will always need valid signed donor info