This is what i was advised...get a can of PlastiDip and spray down the grill. Just make sure to clean it really well before you spray it. It's completely temporary and it has a matte finish. Look it up on YouTube or on here to see how easy it can be. Otherwise if you wanted more permanent than temporary, then get self etching primer or scuff with scotchbride pads and some rattle cans of matte black. You can try following up with some matte clear coat to help seal it and protect it.
I just masked everything off.
As for the chrome, once upon a time I built a couple of sport trucks and when I would color match the grills I would use a razor to make a small cut for a starting point and then take it to the car wash and blast off the rest with the high pressure water. All you need is a spot to allow the water to get under the chrome and it will just flake off from there. Hope this makes sense.
I will post pics later, i have a tj and taped off the raised part of the hood and painted it flat black. it took a few beers and viola it was done. i made sure to use two good coats of primer. i also lightly sanded the area to help the paint stick better. i masked the area off and sprayed away with rattle can. it has been over a year to date and still holding good. i live in ohio so its subject to the best of weather here. lol. i am painting the grill once it warms up a bit. the best way to paint plastic is scuff it up with sand paper and use spray cans designed for plastic.