You said:
(I'd like to find a clean way to cover the tow hook holes as well, but I haven't figured that one out. I want to be able to clip a cover in place and be able to remove without reaching around the backside of the bumper.)
You could make a plate to cover the tow hook holes, then use small bungee cords or a stretch rubber to attach it. The pull from the cord would hold it in place, and when you need to acsess the hook, all you would need to do is pull it out and unhook it.
