You say your chances of finding a job after modular training are slim. I'd suggest your chance of entry to any cadetship is going to be far slimmer. £30K is a rather substantial sum of money and would get you a long way going modular, at least CPL/ME and FI rating. By which time, if you've been working, you'd probably have earned enough to do your IR and MCC. Putting all your hope into a cadetship while you could be working on your PPL and experience building could be a mistake, even if you do have age on your side