IR works great in the car. That's what all head-units use.
I suggest you get a USB-UIRT. Then you can use it with Girder to learn any IR and to send any IR. For a remote you just buy a real car-remote or steering wheel remote from Pioneer, Kenwood, or Sony. You can also use it to send IR to your car-sterio (if you have one) and your LCD screen (like send IR to change to back-up cam for 10 seconds and then back to VGA).