WOW.....
Long term planning is always good, but in this case, drop all these dreams and focus on just getting through the gates of Aubagne and getting selected as rouge.
You will not be some super soldier secret agent intelligence expert on leaving the Legion, try just focusing on being a good Legionnaire first.
Baby steps....
Also....
I think your view of the Legion is, well, interesting.
Your grasp on reality is.... "unique", hehehehe, but if you actually go to Aubagne I think the friendly staff will help guide you with constructive career counseling and helpful instructions.

Do you even have a plane ticket yet or a plan on when you are going over there to try and enlist?
Do you speak French?