Having been there, done, that, etc., it's not all what you may think it might be. Lots and lots of paperwork. Out of a 40 hr week, plan on 15-20 hrs. justifing what you are doing. Incredible buraucracy. Mgmnt. are somewhat in the know, but in many cases don't know the diffierence between flightline and clothesline. The higher you go the dumber they get. Plan on many meetings over meetings over meetings before you get to the real issues. Then, the issues are diluted before you can act because you don't want to upset the air carrier you are assigned to because you will end up in the boss' office, after they got their butts chewed by their boss', because you did your job. expect budget cuts because all the operating budget was transferred to ATC to cover their salaries. As an Air carrier ASI, you'll sit in the sim and the jumpseat for hours on end then back to the office to do paperwork and data entry in your computer. This is one of these jobs that you have to be careful for what you wish for. Remember flying the line and saying "I wish the FAA would do something about this or that". Well, chances are it already been recognized but there are not enough hours in a day to do it all. You will be doing the job of at least three inspectors and given the resouces of near to nothing. If you are a goal oriented person, expect to burn out real fast.
But if you still want a job there, get to know the FSDO manager by being a Safety Counselor, or DPE. Volunteer to put on Safety Seminars or help out at ones. Then let them know you've applied. Also it helps to put Alaska Region on your application then when you get there, start bidding ot get yourself where you want to be. All this helps to get your name known and end up on the "short" list. When I retire from where I'm at, I'm going back to get enough time for the retirement. (about 8 months).
Best of Luck!