Not quite sure how an AK, RPG or even an AH is going to shoot down a Reaper at 25k. Detect is your first problem!
Of course what some fail to appreciate is that the aircraft is equipped for the current conflict. If there was a need it could be equipped for another conflict, putting a simple DAS on plus Aim9x/ASRAAM wouldn't exactly be difficult and if at the end of the day the worst happens it is only £10 million down the drain, not £80+ million and a life or 2.
And yes, lots of people have thought of this!
Like the A team clip (now where did we put that Reaper gun pod, must be in those isos out back!)