You could Powdercoat it in high temp. And it's very durable. But, once chipped no touch up.
I used a Harley Davidson high temp wrinkle paint on a Bmw valve cover once and it turned out great. It's in a rattle can, you have to put it in your gas grill with a temp gauge at about 200 for an hr. And voila it "done". You could put in your inside oven if your wife's likes all the off gassing. But, save the alimony and use the outdoor grill. Your local pro painting shop sells ultra thin masking tape to cover the letters up, I block sanded my raised letters with 400 to 1000 when done.
I'm pretty anal on this stuff.
81 CJ7 Renegade, Mocha Brown Metallic and Tan, 4.0L w/ T-5, RE 2.5 Lift, 31 BFG's on Wagon Wheels