As I understand it , wannabe, you have a degree, have not entered as an officer, and are holding below sgt rank. Suggestion: can you apply for "airman-type" tech training in the interim- either avionics, engines, airframes etc under the banner of " having tech knowledge will make me a much more knowledgable, therefore valuable aircrew member" in later life when you are CR aircrew. Alternately, if you are commissioned, see if you can get Engineering Offr training. Either way you will be better off personally/educationally and the RAF will be better off. It would probably be of benefit to you personally when you get demobbed.
I wuz a GDNav, and in retrospect it is appalling how little knowledge/training I/we had in general aircraft systems.