GM2 lockpick for a 2013 Denali HD Nav head unit

[pendragon]

Has anyone added a GM2 to a 2013 HD head nav unit, I want to add a front facing camera for park assist support, but I also want to add an additional audio input channel so that I can hardwire a Sirius (not XM) radio into the unit, I haven't been able to find a radio that will work with the 2013 and the stearing wheel controls, the XM tuner is integrated into the Nav unit on the 2013 so I'd have to get some form of Bus harness to get the additional input.

Any thoughts?