I use wwPacker+Custom Nand-Loader MOD 1.1 for NTSC VC titles on my PAL Wii.
Works every time. Was a while ago I used it, but I'm fairly sure it makes the wads region free, so I would imagine it works the other way around. There's also FreeTheWads you might want to try. It's more or less useless for PAL consoles, but might work better with NTSC consoles.