I just did a small write up on how I got my steering wheel buttons working on the PC.
Your current USB IR reciever might work depending on whether there is a Girder plugin for it. Once Girder can see it, your home free. You can program the remote to do everything and the steering wheel to do the 8 most commonly used buttons.
I'll try and investigate your remote to see if it will work.
Here's a pic of the Alpine remote below. It's smaller than the RDAT, but thicker as the knob can pop out.