I think you've proved to most of us PPRuNers that you know what we're on about. I wouldn't bother with the GCSEs. It might be worth while calling a few 'sponsorship offering' FTOs like OAA (Oxford Aviation Training to the old school boys) and CTC for their opinion and whether they'll accept what you've got as equivalent qualifications to A Level standard. Most sponsorships, as you'll know, require 2 A Levels so that's what you're looking for. You can contact CTC on +44 (0)23 80 737 567 and ask for Jo Ward or Oxford on +44(0) 1865 841 234 and ask for Mike Griffith.
Good Luck,
S88