Whether you release the app or not, you have the fundamental problem that you cannot read out SMS / be notified of incoming SMS in a non-hacked way on iOS systems.

My plan is to use the CAN bus shield and do all of my control through the Omega. Since I can't connect to the Bluetooth I'm thinking I'm going to use the WiFi and a cellular connection to control it. Someone published the GMLAN Bible which has a comprehensive list of controls and codes for GM cars. I'm going to be installing this in my new Pontiac G8. I'm pretty stoked.