If you're down to splice into then yeah. If you're using a slim fan it would probably be a good idea to use a relay but I have mine set up without and I haven't noticed anything abnormal. You're not even going to the dsm harness. Jump the fan resistor wires and then run the two fan switch wires to the sensor in the radiator then the power and ground. If you're going to use those quik splices or whatever then I would recommend using a relay. That would save you having to actually cut off the stock gvr4 fan connector.
I was in a hurry earlier I forgot to double check which side the picture is looking at. I am pretty sure it's looking at the side without wires.