Okay guys, I can't wait for schematics.
Here is my solution for MeanWell SE-600-R16VAI.
It's manual, yes. But it will work for me, because I don't plan to load PS for more than 250W. And advantage is its 100% reversibility. Nothing was cutted, destroyed or even soldered. All you need is Zalman Fan Mate or similar fan controlller with DC regulation in 5-13 V range, a few centimeters of heatshrink, knife and pliers.
Just remove 2-pin connector body from PS and remove male pins from controller's connetor and connect red and black wires accordingly. Leave white (yellow) wire not connected. And here you go!
BTW, real fan voltage is 14.7 VDC when nominal fan voltage is 12 VDC, and it's a reason why fan as noisy as rack server.