I already got 480p enabled, and it's still not running properly. Most of the games that I wish to run in 60Hz are older games from the N64 era. Newer games might work differently compared to them.Have you tried using a component cable and setting the system menu to 480p? Then PAL and NTSC games should both happily run at 60hz. I never needed to force a video mode for the game that refuse to run in the wrong video mode, because 480p mode is the same for NTSC & PAL.
It seems a whole lot less hassle than changing your region anyway