Rugged Ridge (and probably others?) make a license plate frame which clips to your fairlead roller.
It easily unclips when you need to use the winch. I have attached a couple of braided steel wires to (hopefully) deter theft. It can still be detached, but won't get lost.
I've seen another license plate frame which attaches to the fairlead but hinges up when you need to use the winch. No idea on the manufacturer though.
Both of these options should be easy enough to fab up at home, but sometimes it's easier to buy off the shelf.