Thanks for the feedback. After looking around, this steering wheel control looks like it might work: http://www.amazon.com/Metra-Universal-Steering-Control-Interface/dp/B0052HXPAI/ref=sr_1_2?s=automotive&ie=UTF8&qid=1405569033&sr=1-2&keywords=axxess+wheel+control. I don't like the idea of this kind of add-on, but it should work.
Regards,
Dan