Has anyone tried this yet? I have a 2020 2500HD WT that I want to do this too. I have order the steering wheel harness, radio switch and control. Will be here Monday, I assume it is doable. I wanted remote start, so I ordered the kit from GM Parts Direct and the only thing that showed up was 2 fobs and an authorization code. Says you just need locksmith to reprogram (Im scheduled so we'll see)