Umm ... you're aware of the fact that you can install games to USB already with WUP Installer GX2?
It works just fine. The only downside is that your drive has to be formatted to the Wii U filesystem and thus can't be filled up with Wii games as well (although you can inject Wii games and install them nonetheless).
The
only thing which is not possible (only with some workaround) is having Wii U games
installed to a FAT32 drive.
So if you want to have Wii games on a drive as well, your options are:
- Have two drives -> 1x WFS for Wii U, 1x FAT32 for Wii/GC/RetroRoms
- Have one drive -> 1x WFS for Wii U, optionally put Wii/GC/RetroRoms on the SD card
- Have one drive -> 1x WFS for Wii U, convert/inject Wii/GC/RetroRoms into installable Wii U titles (does not work for all retro systems obviously)
- Have one drive -> 1x FAT32 for everything including Wii U games (but rather as Loadiine games than installed to home menu) using the FAT32 build of Mocha