Can't you self certify to fly light sports aircraft in the UK, the hours of which count towards hour building?
The more realistic option is to stop any thoughts of potentially pouring good money after bad, until you have your Class One medical in your hand.
Resign yourself to the fact that you are probably going to have to retake your ATPLs. You will probably take a lot of pressure off yourself. Start studying now. You've done it before. You've probably still got your notes so you should only have to pay for brush-ups and exams.
Do your hour building at a leisurely pace and find yourself a good instructor to 'mentor' you to CPL standards. Burning holes in the sky is only good for that!