I think what Jake means is that a 911 motor creates more heat therefore requires more cooling, But you knew that anyway

Im still trying to fathom how a 911 motor is 3 times bigger than a 2.4 T4
Thinner oil will certainly help .You could use an aircon compressor pulley clutch to disengage the fan during warm up.
Or just flick the belt off.
I've never seen damage from cold oil, only hot or old overheated oil will give you trouble.
There seems to be a big deal about Porsche fans overcooling but as yet I've not seen anyone have an issue because there engine was too cool.Its about efficiency if its too cool its not as efficient as when its at operating temperature.
Someones time would be better spent working out a variable pulley system which changes the ratio, dependant on temprature and revs, rather than trying to use a fan which is designed to cool a 44 horse motor