The only thing now I can assure about Wasabi DX is that it really works. Even my (8 years old) son play games each day, starting my 4.2 (USA) bricked Wii while pressed on the center of the D-Pad of a standart GameCube controller attached to port #4. It's the standard procedure now.
Although, there are some exceptions like the disc inserted must match the region of the Wii (in this situation must be a NTSC-U disc). I think, this explains why the Universal Unbrick Discs or similar others doesn't boot (because they are originally PAL). Patched, isos doesn't work too as far as I see. Other than that, Wii itself is media sensitive and Wasabi DX too.
So anyone who wants it to boot must match some other criteria.
You have to have a working iso and write it on the right media with the right burning tool at the right speed. So if everything goes well I think you can start Super Smash Bros. Brawl too, on your banner brick Wii.
For me, ImgBurn at 4x on a Verbatim DVD-R worked as well as an old Philips DVD+RW (and another one from the same box didn't work... funny!!). You should know that as higher speeds (8x or above) slow speeds like 2x or 2.4x might not work too. It's a matter of environment and conditions.
For now I'm waiting for SSBB to finish downloading to test my theory.
Though I don't know exactly what to do after it works...