Homebrew Channel to install it onto your system. This does not require Twilight Princess in any way. At that point, you can run AnyRegion Changer again, and change the settings back to what they should be.
If it is not modified with a drive chip, you will probably need to get a Japanese version of Twilight Princess to change it back. I am not certain on this at all, but maybe the Datel Wii Freeloader could also work for you.