Specular Color

Spec on caucasian subsurface profile skin looks slightly metallic, because it’s slightly peach tinted. It’s extremely frustrating. I would very much like to be able to add a tiny touch of cyan/blue to the spec to counter-act this. I can’t, because coders have decided to hard-wire things to be more “realistic”. The problem is, it’s not as realistic as they think, because they didn’t manage to code all the interactions of light and materials. I’m not insulting them for not being artists, I’m sure they’re great coders and I can’t code. I’m annoyed with them for not leaving me a work-around that has been available to me for the last 20 years or so, in almost every other rendering engine ever, through which I could have made my skin shader that much better.

Or maybe someone here can show me a work-around? to make the specular highlights on skin slightly more bluish?
Maybe use 2 lights, one for diffuse and one bluish for spec? But I can’t find any controls to do that either.