[Snax]

I'm confused on why you would want the motor to run vs. preheat via plugin. The block heater I used essentially had the motor up to near operating temperature when I got into the car. Not just 'warm', but hot!

To answer more directly though, I'm not sure what you want to do is easily possible. No idea how that would work aside from just starting it up manually, and that seems wasteful compared to the heater option.