You want to give up a solid career with the FAA as a controller for the airlines? Why not retire from the FAA and then do whatever you want? I had the same opportunity years ago and I chose to fly but had I taken the offer with the FAA, I would have been retiring in a few more years. I still regret not doing ATC when I had the chance. I would have retired before the age of 50. If you retire at 50, you can go back to flying till 65 if you wanted. Enough time to get the flying enjoyment out of your system IMO.
Oh and it did work out for me in flying also. I am a captain on the A350 and was an A330/B777 captain previously. Early 40's. In hindsight, I would have taken the FAA opportunity and never looked back.