why?
You want to play a japanese MMORPG?
you know only ONE game requires this IOS?
it has its own Wii HDD format, and can't use FAT32 or NTFS to install the game data.
using 2 USB will be required (the ISO and the WiiFS), not sure it's easy to manage two USB type at the same time, for a single game that nobody will play because you need a subscription to play that game.
if you are willing to pay to play that game, why not just pay for the game too ?
Edit:
I vaguely remember someone testing that game with loaders and iso when it was released.
I know it's possible, I just don't think using cIOS is the way to do.