If you are looking for the clean look, there really isn't any alternative other than to refinish the bumper. You could wrap the car, but that would be pretty expensive, and you would still have to fill and smooth the holes.
If you do fill the holes, I would insist on the body shop using either a urethane plastic welding kit
https://www.northerntool.com/shop/to...6118_200626118, or some sort of flexible filler like
https://www.amazon.com/xpst-4008-Fle.../dp/B005Y2KM4S or
https://www.amazon.com/FLEX-FILLER-F.../dp/B0002JKE50
Basically some sort of flexible filler. Regular bondo may just crack down the road.