I am impatient and didn't want to mess with software fixes for my lack of a DVD drive, so I wired a Wiikey that I had sitting around instead. I cut it nearly as small as I could since there isn't a lot of free space in this portable. I had to hardwire a microSD card too since it requires some kind of SD card to function.
10 of the data lines can be wired to vias underneath the GPU, but the other 8 have to be wired to traces on the board, similar to the Bluetooth data lines. Those 8 data lines are the ones to the left of the capacitor.
Now I can finally play Wii games with a normal USB loader and no other software mods. A software fix may be better, but I love wiring so this was a great solution for me.