Without wishing to enter the usual inter service "bitchfest" and if your heart is set on becoming rearcrew have you considered a move to the light blue?
As NCO Aircrew the opportunities are excellent with a whole host of possible types to fly on, the bonus of entering as a Sgt, what many consider to be a much better standard of living etc than currently offered by either the dark blue or green and the real time prospect of service beyond age 40.
What ever your thoughts I wish you the very best in your quest
