Yes, if you can remove or add black paint and not mess with the anodizing. Looking over them a little bit, I think you can just add black. But should study the pics more. And you'd really not want to remove or smear any of the silver paint either. That original silver is some of the value of the NOS. Then you'd have to mask and paint ALL of the black over again to make it match perfect.
Would surely take some time, skill, and finesse.