Does anyone know if it is possible to create a shader in the Blender node editor and then import it into Unity?
It is not (afaik), Blender materials/shaders are an internal format designed to work with the architecture of Blender, and completely different from Unity.
It may be possible to program a Python plugin for Blender, but I am unaware if anything like that exists.
I didn’t think so. I was just hoping that maybe it had been done before:(
Oh well. This will give me an excuse to learn how to code my own shaders(or download the strumpy shader editor).