Hi Tom,
This is why we come on these fantastic forums, to learn from one another. I myself discovered that Arnold's Colour Shuffle Node equivalent is C4D's native COLORIZER node. This was a complete accident. I hardly use C4D's native tools as I was very much focused on Arnold's tools. Arnold is very slow if you are using a CPU instated of a GPU to render scenes. The immediate response of the IPR is just not fast enough, especially as you are editing material and speed is everything.
I discovered that Corona does a much faster job on the IPR and is very fast in comparison. Anyways, wishing everyone a fantastic week ahead.