There is a way to do this. I know of only one fan hub that can do it. It is the Phanteks PWM Hub. It is a fan Hub that MUST have a PWM signal from a genuine 4-pin fan header to work, and pretty much any mobo's CPU_FAN header does that these days. This particular Hub is unique - not like other 4-pin fan hub systems. This one uses the PWM signal to create its own set of six 3-pin fan headers each operating in Voltage Control Mode, which is what is necessary for control of 3-pin fans as you have. Like other hubs it gets its power from the PSU directly, via a connection to a SATA power output from the PSU.
HOWEVER, you are proposing to use fans with MUCH higher power consumption than most. The Scythe Ultra Kaze 120mm fan uses 0.60A at 12 VDC, or 7.2 W. That's 3 to 4 times a "normal" fan. Now the Phanteks PWM Hub says it can power up to 30 W total for all fans connected to it. If you insist on using those fans, one such Hub can handle 4 of them. But if that's your plan, there still is a way. Just be aware that your plan is to use nearly 7.2 A (~86 W) of power from the 12 VDC output of your PSU for fans alone!
If you really want to do this, you will need three of those Phanteks PWM Hubs, a 4-pin fan splitter with 3 outputs like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812423163&cm_re=4-pin_fan_splitter-_-12-423-163-_-Product
and a PSU that can handle this fan load in addition to whatever else you're doing.
Normally one should never use a fan splitter with 3 outputs because a mobo header can only power up to 2 regular fans (not the heavy-duty ones you plan). BUT in this case the splitter will NOT be providing any power to any fan. It will be used solely to feed the PWM signal from one CPU_FAN header to three Phanteks PWM Hubs so each of them can use that signal to control its own headers.
For each Phanteks Hub you connect its female fan connector on a wire to one arm of the splitter, thus giving each its PWM signal. Then you connect each Hub's power connector to a SATA power output from the PSU. Recognize here that, in addition to consuming a lot of PSU power, you will be using up three of its SATA power output connectors. Finally, on each Hub you can plug in FOUR of your 3-pin Scythe Ultra Kaze 120mm fans, thus getting control of all 12.
Every one of those 12 fans will send a speed signal back toward the mobo on Pin #3 of its connector. But at each Phanteks Hub, ONLY the fan signal from the White Port #1 is actually sent on to the mobo, and the rest are ignored. THEN of the three fan speed signals going from the Hubs to the splitter, only ONE of them actually will be sent back to the mobo header. All this is because the header's speed measurement functions can only handle the speed pulse signal from ONE fan, so the splitter and Hubs all are designed to send back only one.