I use my remote start for the same thing and the seat heaters never come on and the ac blows cold but I just leave it on auto.
The srt 8 would be awesome but the mpgs ans insurance would cost a lot more.
Strai I parked next to an 08\10 model yesterday and my car is lower and the stance is wider. I am sure you could swap the grill but I am not so sure it would look good.
P.S. They did away with the chill zone which I thought was a cool idea.