Mist,
It's Specialist Service Officer and its open to people up to the age of 49. I'm sure the OP knows about this scheme already. Yes you can "transfer" but you still need to have the minimum educational requirements for entry into the Army Aviation Core. This would include Yr 12 maths (the hard maths that is) and English plus 2 more subjects. This doesn't seem to be negotiable as I know ex mil guys who have CPL's and tried to re enter as pilots but got knocked backed because of the education standards. Having thousands of hours and an ATPL doesn't seem to hold any sway with the selection board.