Looks like it, though if some weren't they could be masked off. Perhaps call your local dealer and check?
I've just called Blackpole powder coating in Worcester and described the job. They said it would be fine and "we have done Harley stuff before when people want to black out chrome parts." They couldn't give me an exact quotation obviously, but they said it would be around £30, £40 max.
Worth checking out. At those prices, your new rack would be £150 all in
Hopefully, other guys on site might be able to comment further on whether this is a good way to go. You obviously want to be sure you'll get a good end result