Without downloading all of them and blowing hours, does anyone know if there is one that has this option? I want to test if uCON64's region forcing works on a few PAL exclusive games I'm converting for myself.
You can force it in higan by editing the created game folder's manifest.bml and changing "region=NTSC" (first line of the file) to PAL, or vice versa.
Most likely possible with the other emulators, too.
ZSNES and SNES9X have versions that support forcing NTSC or PAL mode as well. They are present at the loading screen.