I think you're making it more complicated than it is, IMO. If you're going to run two pumps, put them in series, and run all the blocks in series: the order is irrelevant.
You ought to be concerned about how each component is going to be placed so that you can drain it easily. I'm going through the same exercise right now, and because of my layout, I'm having difficulties making sure that I can drain at least most of the coolant out.
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