You can't fund it if you don't have the cash!
My advice. Look into cheaper ways of getting into the air, such as gliding. It will stand you in good stead for when you have the cash for the PPL, and you never know you may enjoy it more than powered flight! I have a PPL but still long to fly in a glider again, as frankly it's much more interesting and challenging.
I wouldn't recommend doing and hour here and an hour there as you will spend the whole lesson just getting back into it without some decent continuity. You'll just end up wasting your cash on a series of pleasure flights.