Just download bannerbomb v2 if your on 4*
Put it on your sd-card, with the boot.dol of your emulator, or use loadmii with a bunch of emulators. Put the roms on the card where they belong. Then just click the sd-icon and insert your card, now you have emulators and have not installed anything on the wii.
If your on 3*, use bannerbomb v1 and load it from data management.
I don't know anything about the disk, give it a try if you like.
The above works with any controller.