I suspect you're right about the RAF being unlikely to cross you over as that would leave a gap in rotary (where they've already paid to train you) and fixed wing isn't exactly short of aircrew at the moment. Your prospects might be a lot better in the civvy helo world, or does that not appeal? With your experience, I would have thought you'd be a good prospect.
That said, there's no harm in exploring the options. You'll never know for sure until you ask. Maybe there's someone here that might be in the right place to offer an opinion.
I wish you the very best of luck with your endevour. Here's to a happy outcome.
Courtney