I'm abit confused really, I'll try and summarise what you can really do in this situation though.
AAT then ACCA, this will take 5 years to become a qualified accountant.
AAT-ACA fast track, 4 years to become a qualified accountant.
ACCA or ACA straight off, 3 years.
You're unlikely to be able to do ACCA or ACA straight off without A-levels, even AAT might be difficult.
What you could try and do is join a firm as a trainee, mention that you've enrolled on AAT or whatever and see if they let you.
I have to ask, though, why do you think accountancy is the route for you, and why did you stop self-teaching a-levels? Accountancy qualifications are almost 100% self-taught..