Hi i can answer some of your questions.
Firstly i know loads of pongo type chaps who've made the big break and joined the light blue (as aircrew) - and to my knowledge none have regretted it.
Secondly if you are already serving in the armed forces and change trades or branch of service you generally will stay on 'mark time pay'. That is not lose any money and stay on your current salary until your new trades pay catches up or overtakes your present one. However don't take that as 100% gospel - as there are sometimes differences in each case. Talk to your personnel people for a definitive answer!?
Can't comment on the loadie side but i'm sure someone will be able to help.
However the RAF is crying out for AEOps and you can bet OASC will try and guide you in that direction if you let them.
Good Luck!