Modifying your DS's Wifi ID?

I was just wondering if there is a homebrew app that can allow you to change your DS's Wifi ID? It would make things a heck of a lot more convenient for Lite upgraders, and, with enough community using it, can sort of bypass the friend code system...

What I was trying to do, is I have 3 DS's. I want to be able to play wifi from any of them on the same friend code, mainly just to freak my friends out with Animal Crossing, having an "unauthorized" visitor visit them over wifi via another one of my DS's. Hehe.

Does anyone know if this exists, or if it is possible? I know that it could possibly screw up one DS, but with the bad would also come good. What do you think?