Converting over to a 16" electric pull fan seems to be a smart idea. The caveat would be IMHO converting over to the negative closing thermostat. I understand the principle as to why but the original design was meant to bring the engine up to temp quickly.
Controlling through temperature we all know but how to go about it. I don't care for using a temp probe in the radiator for I believe it is misleading. That placement is competing with the air coming through the radiator itself. You should be able to place a temp probe behind and along the edge of the radiator itself or along the radiator hose.