Why do you want your PPL so desperately?
If it's going to take you five years to save enough money for your PPL, you will probably not have enough money left once you have your PPL to use it regularly. So your PPL just becomes an expensive piece of paper in your wallet.
I have started gliding about two years after I got my PPL and I love it. It's totally different and I always see the difference between them as the difference between sailing and motor boating.
When you go sailing you are busy for a full day. You are very dependent on the weather (wind, mostly), continuously aware of what's going on, whether you can "make it" or need to do another tack, and so on. But at the end of the day the boat ends up at the same dock where it started in the morning.
Motor boating, in contrast, is a convenient and more reliable way of getting from A to B, at least compared to sailing. It isn't all that much work and as a consequence, far less rewarding.
I'm in the fortunate positiion that I have a good enough job to pay for both gliding and motorized flying. But if I were flying on a shoestring I'd probably go for gliding.
Oh, and if you want a PPL to better understand what they try to teach you in your aeronautical study, why not simply set your aim a bit lower? Why not aim for a first solo in a powered aircraft, or a first x-country solo? You don't have to go all the way to a PPL (or a cheaper option such as an NPPL(M)) to understand how an aircraft behaves.