Does anybody have any tips as to how to change a specific colour of many parts at once in a display state?

This is why I ask:  our products follow a corporate colour scheme which unfortunately includes black.  There are many parts and sub-assemblies in our products whose finished colour is black, so when the full assembly is modelled and a drawing produced for quotation/presentation purposes you can imagine large blobs and areas of black making the image look very unclear.

(Unfortunately I am not allowed to post an example of the product.)

It's a bit late to turn the clock back and model every black part in mid-grey or something, and it's so long-winded to change the colour of all these parts in an assembly display state by selecting every individual part.  Is there a quick way to change all occurrences of one specified colour to another specified colour throughout the assembly for one display state?

Thanks, Janek .. SW 2016 User