I think people who want to change language should qualify where they want the language changed.
It appears there are different aspects of the Wii that have localisation settings, but it's not clear which of the changes in Any Region affect those.
Area and System Menu must match, but this looks like the highest risk potential for your system. You'd need to have a copy of the firmware for the region you want to install, so if you're running 3.3 firmware a downgrade to 3.2 would be in order for the same region you're Wii is presently in and then changing Area to Europe and loading the firmware for that area, say 3.2E.
The Language appears to be settable outside of that, but doesn't involve a wholesale firmware swap and is therefore less risk, but it's not clear what this affects.
If I was in your situation I would try changing the Language setting (note, NOT the Area or System Menu) and see if that achieves the desired result. If not, think about installing a different menu and changing the area. I don't think either of these things would change the built in channels unless they're part of the system firmware.
Maybe the dev can give some more information on what the different settings actually affect?
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