(Buy a Japanese Wii) - There is always somebody willing to spend somebody elses money
As u found out, there are a few ways of going about this.
You didnt say what system menu you're running under - this is important as this game contains an on-disk update to 3.1J_v5 (see WUM Wii Update Manager)
....and an out of region update WILL brick.
I would advise you to softmod your Wii, there is plenty of tutorials here:
►RECOMMENDED FAQ's, GUIDES & TUTORIALS ONLY ◄
and lots of willing helpers should you get stuck
(dont forget to post in the Wii section of forum tho' )
Once softmodded you can use Preloader to avoid any updates / region,
and eventually use a USB loader with a backup of your game to do away with disks altogether