I took a ride over to my regular body shop and asked the same thing. I specifically asked about bead blasting the grille and shooting it with matched black and clear coat. His response was they have not seen good results from doing this, because of how Ford adheres the chrome to the plastics.
On the other side of the coin, if you believe what you read on the forums... I've read in many instances where people have gone the bead blast route, used a good bonding agent, then had the grille shot with paint and clear coat.
I decided to purchase a unpainted/un-prepped grille and let my body shop shoot it. I'll turn around and sell my chrome grille either locally on Craigslist or eBay.