ben3, the whole point is that people is trying to play the game WITHOUT having to softmod/install homebrew on their Wii. I'm on the same page - I bought a modchip in order to play games without having to mess with the Wii firmware at all.
Unfortunately, for now, it is just not possible to play NSMB with a hardmod/modchip only. This is the same for any modchip out there. I have a DriveKey myself (and no softmods) and same problem. I guess a lot of modchip owners are holding their breath right now waiting to see if updates for the modchips come out. Otherwise our modchips may not be very useful when it comes to future game releases!!