Hi KK good idea,
your type of method works well for me on my single steam outlet domestic machine. I find best results if I surf the top of the milk to about 35-40 degrees then plunge the wand deeper into the milk to 60-65 degrees. Hotter on the initial surf (40+) gets really stiff hard foam :( Key for me was dont overdo the initial bit on the top of the milk for nice microfoam.
edit to fix original subject line - Andy