The mere idea that the car needs to be recast is very telling in the aftermath of the James Bond BMW Z3 debacle. I guess there is a whole generation out there who are so accustomed to corporate sponsorship and product placement in movies that Occam's razor has now grown dull and rusty. In my opinion...

I nominate John Hodgman for the role. He bears a striking resemblance, and he has a naturally posh air about him. He even mentioned the possibility in his comedy special "Ragnarok".