After alerting you guys to the news, we went into out labs and started testing this for ourselves. After a few failures, we were finally able to come up with a reliable method for making this work every time.
The good news is that this will likely become even easier as time goes on, and needless steps are eliminated. We’re already to the point where we can switch back and forth between our AT&T SIM card and our T-Mobile SIM card without having to reconfigure anything. It’s pretty awesome.