Honestly, it's a bumper. Accept that you'll be repainting it eventually. Theoretically, you could feather sand the edge of the clear coat smooth and then do a spot repair. But a spot repair with anything less than catalyzed clear from a paint gun will look like absolute crap. (And as someone who owns painting equipment, I can tell you that the cost of DIYing a little spot repair properly will be greater than paying someone to paint your bumper. Plus, if you screw up, you'll just make it worse.)
Amen, I own all the normal painting stuff,too, and Maaco just did my Coupe, DIY painting is a major PITA. BTW, Maaco's runnig a bumper paint special on tv for $200.