Definitely not going to be joining opposing factions, unless the RP was worked out with the faction leader(s) ahead of time... The others who have posted are right, it would just cause bad blood.
So, no specifics, but I may end up doing something like this in the future... Though since starting this thread I've come to the realization that I barely have time to play my main Disco characters, much less start a bunch of new ones. So it might be a little while.