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Here's an idea if your Trans Drain plug is large enough.
Drill two holes in the drain plug for a small flexible copper tube. Make a loop in the tube, run the ends through the two holes. Check for clearances inside the transmission. Braze the tubing to the drain plug. Almost looks like a screw in block heater at this point.
Tee into the heater core hose to feed the transmission heater. This should bypass the thermostat. Have the return line go to a low pressure side tee.
Get fittings to adapt the rubber hose to the copper lines.
You should be able to use an electric solenoid valve to turn the flow on & off.
Control can be manual unless you have the smarts to read coolant temps and trans fluid temps and have a home made computer turn the valve on & off.
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