To put it bluntly, I was lied to and had my career destroyed because i wanted to help in the army and some recruiting officer had a quota to fill. I'm out of cpd, out of date and out of patience.
I also suggest that you'll not be successful with the HCPC either.
One of the other things which will really piss on your cornflakes, is that unless you're on the HCPC register, you must not describe yourself as or imply that you're a Paramedic. It's a criminal offence. I'll bet a pound to a pinch of shite, that someone high a mighty will be waiting to leap all over you about that, especially if you piss people off.
Furthermore, even if you did get to go RAMC, as a CMT, your clinical work would fall far short of that required of a UK register paramedic, so it would be incredibly difficult to maintain your registration.
Not too sure what the answer to the problem is for you, but it does sound like you've been well and truly shafted.
In civvy st, if an employer has effectively lied to you to get you through the door, only to move the goal posts once you've signed a binding contract, you'd have a very strong case under the employment legislation. Surely, there must be a similar course for grievance within HMF?
My advice for what it's worth, is to bin the Army if you're able, and get into an NHS ambo trust as an ECA. You can then consolidate your experience and AREMT training whilst making your case for registration to the HCPC.