To reflash a PCM you need to have a subscription to GM's services, which costs mega bucks. I don't have that capability on mine or the clone. The Tech2 can certainly be updated. The one I got has 2013 software on it, the same as my original. I'm not sure how a scantool would fry your electronics ...

You don't need a new steering column if you use a clockspring from a car with the controls. It has the wiring for the controls and the airbag.