Question Controlling multiple 3-pin fans from one PWM header

[usernamesaredifficult]

Hi there lovely Tom's Hardware folks,
I'm about to embark on my first custom watercooled loop and I've got a question about fan control... It's a fairly old case (Fractal Design Define XL), no RGB and I've already got 4 3-pin (voltage controlled) FD fans that came with the case - they're quiet, currently all connected via voltage-droppers (7v, I think) - plus one PWM fan. I've been offered, for free, some watercooling equipment, so I'm going to be putting a 280mm radiator in the top with 2 fans, a 140mm radiator in the floor with 2 fans (push/pull), plus there are 3 case fan slots.
Motherboard has 5 PWM fan headers available - CPU_FAN, CPU_OPT, CHA_1, CHA_2 and M.2_FAN. I'll probably buy another 2 PWM fans. What I'd like is a controller that will take a single PWM fan signal and power from the PSU and output a number of 3-pin fan lines, controlling the voltage according to the incoming PWM signal - does such a thing exist?

 

[dimtodim]

buy this
https://www.arctic.ac/en/Case-Fan-Hub/ACFAN00175A

 

[usernamesaredifficult]

buy this
https://www.arctic.ac/en/Case-Fan-Hub/ACFAN00175A

I'll try to find some more details, but that doesn't look like the right solution. There is no mention of it supporting 3-pin VCC fans, and the images (and the manual) show 4-pin connectors - these will output 12V on the DC rail, so all the fans will run at full speed.
I'm looking for a controller that will alter the voltage on the DC rail for the fans. To answer my own query, it does look like the Phanteks PH-PWHUB_01 will do it, but at the moment I'm struggling to find one in NZ...