It should be possible to do it easily using the controls from flex-a-lite and similar manufacturers - The unit I got for the twin electric fan conversion is made by Hayden automotive and has an AC clutch input, and a thermostat that is inserted in the radiator. I think the cost was around US$60.
The trick would be to supply this relay with fused 12V, and use it to drive the AC fans. All of the wiring for this would be done in the engine bay and in front of the radiator.
The AC input would make the fans operate the same as before the conversion, and the thermostat would act as an extra control, turning them on when the temperature climbed.
Not sure the AC fans could replace the flow from the water pump fan though. It'd certainly be better than nothing and provide a little more insurance for cooling in the event of a main fan failure.
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