I think a little DIY job would work great on the grille. My cousin had took his grille on his 850 to two different body shop already, both shot it for free, so you know what's gonna happen after few long road trip. Plus, I doubt they will really help you to strip out the chrome/aint completely and prime it well and shoot it black.
Most likely they will just do an half-arse job on it. If I have the time, and I want to get it right, I'd try it myself. My dumb way of doing it would be stripping it down with some paint thinner(spray works easier), then sand it down thoroughly, and prep it for paint. Shouldn't take too much time.
But I really dig the look if you can somehow maintain the chrome trim around it with the slash and the badge and keep the rest of the grille black.