2 issues remaining:
- If the original owner is in no faction at all, he can't open the faction module: "You have to be in a faction to activate this ..."
He should be able to do this: "reset faction signature" would reset the old faction to neutral. "enter faction signature" would either be gray-ed out, or also reset it to neutral.
- If the original owner is in a new faction, he can open it but pressing either the "reset faction signature" or "enter faction signature" does nothing besides closing the menu.