Best would be Ryanair or another Irish airline, once you have gotten your EASA ATPL, it's pretty much just do a UK ATPL Check and you'll have both. Alternatively look at other countries outside of Europe, the Middle East or Asia, while they rarely take on low hour pilots they would organise a visa and licence conversion to their country.
The alternative is expensive and you'll have to redo most of what you have already done. My understanding is that they have removed the option of just redoing the skills test, so you would have to redo the CPL course. For the IR I would recommend going down the CB-IR route, that would reduce the course hours to just 10 hours.
As you say you have to do the 13 exams again, get a UK Class 1 and do the RT Practical.
Your hours will count towards the CB-IR and hour building requirements.
Redo your MEP, MCC and UPRT.
Your school really messed you over as this will cost you a lot of money, definitely go to a modular school