If the aluminium brake track is to stay grey long term, the only option will be some genuine ceramic coated rim (probably from Mavic) that probably is no longer manufactured and won't be available in a width of 23mm.
The grey coating on the rims you mention is just anodising. Grey 'hard' anodising on the rims mentioned may resist colour fading better than black or other coloured anodising, but will still eventually turn silver with use.
If the aluminium brake track is to stay grey long term, the only option will be some genuine ceramic coated rim (probably from Mavic) that probably is no longer manufactured and won't be available in a width of 23mm.
The grey coating on the rims you mention is just anodising. Grey 'hard' anodising on the rims mentioned may resist colour fading better than black or other coloured anodising, but will still eventually turn silver with use.