Bear in mind you will need the car in Ready mode though so the dash will be lit up etc, any running lights will be on.
If you want to do it without any of that, the only way is with the timer and that has a limitation of 30 minutes.
I've highlighted the key to my statement for you. Perhaps you missed it first time?
It will, but that is not wind chill, just forced air cooling. In your example of 2 degree C ambient, no amount of wind can reduce the battery temperature below that. It can only make it approach that.
Wind chill doesn't affect inanimate objects with no water to evaporate