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Hi Revnart

It is pretty clear to me from your example  that I am not familiar enough with your technique to be helpful.  I am quite familiar with the independent components of Luminance, Sat, and Hue yet not when a full band of a color spectrum comes our as pure gray.

Given that your original question was just automating a technique that is working well for you, and that I don't understand your workflow, I cannot answer your question about automation either. 

So my conclusion, I am being a distraction to your primary goal/post and maybe another forum member can step in with some more focused recommendations.

Your approach sounds interesting so I may have something to learn and will monitor the thread.  Sorry for the distraction.