Supercopa rear bumper diffuser wrap

[Gaz supercopa]

I'm looking to black out my number plate recess and diffuser on the supercopa like the standard bumpers have in black. I know on the standard bumper the trim panel comes out and can be replaced. The supercopa bumper is all one.
Has anyone blacked there's out and did you wrap it or have it painted. I don't want to go to paint just in case I don't like it and want to go back to red

Tia
Gaz