If I'm honest, I'm not a fan of all the RGB craze, I try to avoid them as much as possible. And so I don't know much about the matter.
A quick search led me to this page: https://pcsavage.com/best-arb-and-rgb-fan-controllers-of-2023/
The Deepcool one could fill your needs. Connect the 3-pin cables to it for the RGB and the 4-pin ones, with the necessary splitters, to the motherboard for the speed.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.