I've tested this. Poser replaces the entire shader with whatever it says in the material section(s). That means you lose nodes of any kind.

The only way i know to do this is to write a Python script to do the incremental changes and then a matching pz2 to call it. It means having to make two files for each color, but the pz2 is trivial.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)