The aftermarket kits which give you steering wheel controls for the audio on your aftermarket radio *almost always* require you to give up the little screen and your back-up camera - They use the cable off that screen to tap into the CanBus signals. I have the Pioneer NEX-6100 nav radio installed, but kept the screen and my OEM back-up camera. Not sure Fords camera is compatible with your aftermarket radio, even if you knew which wires to tap into. It's a CanBus device too and I don't think aftermarket stereos are know what to do with those signals . . . . they're looking for a plain old video signal
Anyway, good luck with your install and let us know if you find anything promising. The cheapest solution since you weren't looking for a nav stereo would have been to buy a used radio just like the one that came in your TC on eBay - Lots of those kicking around for $40 or $50
Don