In Unreal's Material Layer system, can I create a Material Layer that adjusts the saturation of the layers below?

Hey man! I appreciate your assistance but I think you may of gotten mixed up with my question and what I was trying to achieve.

I did exactly what Fafhrd recommended and it worked just as he described. So I can confirm his results as well.

I think it was just a big misunderstanding is all. But still, thank you again for your input!