Update your Wii and follow the latest 4.2U Softmodding Guides (it's just easier to have an update Wii for certain things I find).
After you've done this you should have a homebrew channel from which you should be able to install Gamecube Loader Apps in, which should play the PAL Region Games.
Look on wiibrew for some apps.
I've read that you should just be able to play them no matter what, but if not this may be a workaround for you. If you need anymore help just ask.