Another angle is to continue joining as a ground trade and then transfer to Senior NCO Aircrew once you have a couple of tours under your belt, most of the guys on my training (admittedly back in '88/89) were ground trades retraining to aircrew.
This way you become Pro Aircrew, learn some real airmanship and earn a bit more towards the Flying Training coffers....
I joined as a Direct Entrant Air Loadmaster and was streamed onto Rotary (the Mighty Wessex at Shawbury) and was then thrown out after 130 hours (long story!!) but I had a thoroughly enjoyable experience, really useful for civvy street and really helped my Private Flying. I also blagged some decent left hand seat time which was slightly different to the C150/172 I was rated on!