Just kinda spitballin here....but what about a couple of those big black rubber torpedo bumpers (I think they called them titties)...like on a 57 Chebbie for those headlight holes...
Here is why I won't be adding Chebbie Titties to my bumper...like I need justification. I am going to make a recessed panel that will hold a billet Tow hook that will hang in the down position but hinge "up" if ever needed. Once the recessed panel is made and welded into place the Tow hook will not stick out past the bumper and rest on a rubber cusion. The recess will follow the contour of the Tow hook and have a 1/4" gap around it...If your cant follow my vision all will become clear as mud once I get it made and take pics. The Iphone is for size comparison. It should look very clean and suttle once complete.