But you could band to SWS and then exchange it with a character in your territory, and then you get to keep both, right?
Hmmm..... that one I'm not 100% sure about. I am inclined to say "correct," but I don't know if the exchange carries over the fact that the EC came from your opponent's territory.
You'll have to wait for the experts. Sorry.
SWS can only be switched for one of their guys. read the ability.
Actually, the ability says "any," so it does not have to be your opponent's. In fact, I think SWS's usefulness can come from taking your own EC out of fortresses like Kingdoms of This World.