I think trying to map RPG conceits to movies as a means of making rules arguments isn't the way to go. The ruleset is designed to make for a fun, playable, balanced game; it's inspired by what we see on the screen, but it isn't meant to explain it on a 1:1 level.
When the question becomes, "How do I handle Duty and Obligation when I have one AoR character, one EotE character, and two characters who straddle the line?" you've officially made things too complicated, IMHO. The GM needs to decide what the group theme is, and stick to that. After all, if one player makes a character who's a spice-running smuggler out to make a buck and keep his own neck safe, that doesn't mesh well with a group of three other people committed to being a Rebel saboteur squad--regardless of the Duty or Obligation mechanics.