I didnt expect to get this far with this project.
Now.. I dont think I clearly explained that in this version, I am writing to SAMPLES not points. ( and thanks to Matthaeus ( the Kristinka ICE hair author) for letting me know how to do that, as I couldnt figure it out on my own.)
1: set 'some-custom-color-attribute' in per-point, per-polygon or whatever context
2: Get>NodeLocation > Get 'some-custom-color-attribute' >Set to Vertex color property
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