Do your DSC1 it will help you get your FAC. As other have said not a legal requirement, but recognised by lots of police forces as acceptable training. It's no alternative to experience but that's a bit of a chicken and an egg situation isn't it in your position. You mention paid stalks this is what I was going to do, but my local force, Sussex, would not accept my application even though I had a letter for a professional stalker saying i had been out stalking with him and had paid for more. What was missing was a bit of land to shoot on on which my gun (FAC application) could be registered too.
I was stuck for a while and then remembered an old mate that had a farm, and quick call and all was solved.