I've never heard of anyone trying to get the radio from a head unit to CF. I don't know if that's even possible. However, if you want a good FM radio, pick up a HD radio. You can get one for about $30, and then buy Mitch's HD-USB cable and drivers, and you'll have FM, AM, and HD.
So, for about $70 you'll be up and running. That's what I did and I'm extremely happy with it.