The chrome is not removable. Well, it sort of is, but it would leave holes/slots where the clips go.
I also have a black SHO and hate chrome. I went with an interceptor upper grille, and the one shown below for the lower grille. It's darker, and has no chrome.

Part No: DG1Z-17K945-AA
Also got me some of these:

Part No: DG1Z-16178-C (right) and DG1Z-16178-D (left)
(hope the image link works -- this is my first post on this site. Is there a place to set up a gallery of images?)
Finished product: