Best way is to catch some ice, drive off the road, mess your bumper with a cattle guard, and use it to make cutouts (plus backing plates) to eliminate reflectors on new bumper
. And yes, I did just that
With a good bumper, I'd wait until you have enough rock chips to warrant a repaint, which is the proper way to do it. In addition, if you want it to last, you better use the same bumper material to fill the holes plus a larger backing plate to secure the cutouts, but you'd need a damaged bumper for that.
The other 2 options are clear reflectors (not remotely close to OEM fit and quality, and only 'DEPO' makes them), or OEM body-colored reflectors, which look like patches to me, so I was going to live with the stock reflectors... until my little off-road excursion. I also had the bodyshop paint the stock gills (along with their black inserts) body-color, and looks great now. Good luck.