I was looking for a similar solution and the best i found was an online degree from TESU (Tommy Eddison University) and taking the credit for your ratings as well as previous school. (I have about 2yrs before I dropped out to pay for flight school). After enrolling in the required classed take the CLEP exams and clep out (entire websites dedicated to this) so you dont have to waste time in the classroom and save some cash.
(Full disclosure I am not currently enrolled, but plan to in the near future so I will be competitive by the time I have the hours needed for the big leagues.) This is the best solution I've found after spending a lot of time researching the quickest and cheapest way to check that box.