So no one has tried this yet? If not I'll see if my friend and me can give it a shot later once he gets home. So far using the save that was posted earlier He and I started from the beginning on DD and made it through the first six stages, so that leaves 7-10 for us to do but I'll test this one. Thanks.

Edit: I can semi-confirm this works. My friend and I continued from level 9 where it starts in the save file, I switched the equipment for myself and the Shadow Bro to the lightning and magic boosters, and when we went through the first portion of the level nothing popped and we died. Restarted, made it through the first part of the level and when we got to the second part, the trophy popped. Not sure what the difference was, but I was able to get the trophy to pop.