If I understand you correctly, you want to be able to pose and render but have all the items appear to be colored solid, no reaction to light, right?

Select each material zone where you want this to happen, turn off the Diffuse_Value and Specular_Value, then turn on the Ambient_Value and set the Ambient_Color you want. No need for post work. Don' forget that you can save the character like this and get him back any time you want.

In this screen shot, I'm showing the shirt material.

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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)