Yes, I know what you mean, but I was thinking of getting 2 of this
https://www.amazon.co.uk/Akasa-AK-CBFA07-45-Flexa-Splitter-Cable/dp/B008PO4X2E/ref=sr_1_2?dchild=1&keywords=fan+hub+powered&qid=1595450912&sr=8-2
3 ML to one, 3 LL to the other, then the headers to the pump. That way I can control each group?
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Edit
Another option, is to buy not h100i Plat, maybe Pro, and use the non rgb fans as pull with front LL of the case as push. Is ok to do push/pull with LL push and ML pull?