Well at least you've set your goals low . .. . . .
I would imagine a degree in astrophysics coupled with some front line FJ time, QWI , definately ETPS would put you in the running. But then I'm not a careers adviser so don't quote me.
Question to ask yourself is, I am doing the FJ thing for the right reasons ? You need to be very committed and dedicated to make it through to the front line, and it's a career that is not to be undertaken lightly.
Good luck . . ..