Well, as you are supposed to play PlaneShift for the roleplay and not consider it "another PvP game," I don't think that idea will work out too well. It sounds like a fun thing to do maybe once or twice, but I don't think that logging in with an NPC monster model is going to captivate too many people for an extended period of time. There's no deep story, personality, or behavior that you can create there that has the chance of being as rich as a PC race.