If you want to go for the absolutely simplest way to debadge, someone had sugggested that you get 4 round 3 or 4-inch bubble-type mirrors, and just stick one on each center cap.

I did it, and it looks way better than having "Isuzu" there. Yes, its kinda ghetto, but it doesnt take a lot of effort, and it adds a bit more shine to the wheels...