Why not just sit English, Maths, Economics, Politics and General Studies at A Level and GCSE in the next sitting? They should be easy enough with no/minimal revision given your now your undoubted skills developed throughout your degree.
A lot of companies are going to be unsympathetic, as they are stipulating this arbitrary hoop to filter out candidates and cut their workload.
If there's a hoop, jump through it. It'll cost between £250 and £500 quid, but the return on investment is huge.
Best of luck!