Originally Posted by squeakywheel

You are essentially correct. The only thing I can say against this method is that the powergrips can drag the ground when you are pedalling with the pedals upside down. For this reason, I usually would start with my right foot securely in the powergrip and try to hook the left side one on the first rotation. I'll admit to a quick little look down while doing this. Some people might not like that distraction in traffic.