What I would recommend, is mod your system with Softmod Any Wii guide. Then get a USB hard drive and format it as described in our FAT32 guide.
Once you have that, you should be able to install the contents of the disks using the USB Loaders that we give you in chapter 3 of any wii guide.
When in the USB Loader of your choice, and you have installed the games to hard drive, you can modify the run-time settings of those games so the video is "Force PAL".
That should (or with minor tweaks from my general instructions) allow you to play NTSC games on your PAL system.
(I've done similar steps using PAL games on my NTSC system).