Gliding training as a supplement to power training? In my opinion, not the best idea. Not the worst either, it it just a distraction. Gliding is wonderful, and yes, it really does teach you precision in your flying, and how to get the most out of the simplest aspects of being airborne, which has great importance.
But it will distract you somewhat, because some aspects of flying unpowered vs powered are different. From what I understand your position, and challenges are, my opinion is that this would be more a detrement, than a benefit to your progression with power planes. If it interests you, certainly go try. But as a diversion stepping stone during PPL training, it won't get you any further ahead. When you get back in the power plane, there will be a few things you have to do the "other way" again, and this transition back and forth requires a pilot skill set which is still just at the very beginning for you.
When you're learning and practicing something, If you're struggling, don't change what you're learning in, but how you're learning in it!
Once you're very confident in a type of aircraft, very certainly, try others, and master them. There are dozens of different configurations of aircraft, and they all have their merits, and you should learn them all if you can, but one step forward at a time...
And by the way, some pilots are too good to fly aircraft that remind them of "Spam". If the plane looks like spam, smells like spam, contains spam (not in its original can), I agree, don't fly it. Otherwise, a well maintained, clean simple aircraft can be a delight, and has a vitail role in the economical training of new pilots, and the long term satisfaction of experienced ones. 23 years ago tomorrow I bought the C-150 which I fly regularly, and have no intention of selling. It is one of 81 different aircraft types I have flown, and it's still what I prefer, when I have to pay to be airborne!
By the way, I looked at the pleasant Cessna 162 at Oshkosh, and although I quite like it, it seems no less a "can" than a 150. There are very certainly safety and structural reasons I prefer a conventional construction metal airplane over some other designs, but that is a subject for a different thread!