Seriously, I would just leave it. Wet sanding the entire car is a huge job.... huge enough that obviously the people who painted it didn't even want to do. Using a yellow pad and just going at it until the peel is gone would not be worth it, IMO, and could very likely take off more clear than wet sanding. Also, the fact that you are afraid (not a bad thing) you might burn through the clear is another sign that it may not be the job for you to do. I say just do as good of a detail as you can with the mild to moderate intensity products you have and just be happy where it's at. ZPC on an orange pad will work, but it's not gonna get you even close to where you want to be in terms or removing peal. At best, it will remove slight scratching and marring on the stock GM clear. But, it's been repainted, so that clear could be any level of hardness.