Bravo to your son for making his knowledge real, by experimentation.

fwiw I don't know of a stove type that you can't construct a wind screen for, including those that sit on top of a fuel cannister. $3 will buy you an aluminum turkey basting pan, which you should be able to cut and shape to be a reliable windscreen, which folds up for easy transportation.

Also remind your son that another screen can improve boiling points - beneath the stove itself. So cut a round bit of aluminum and put it under the stove, which with a proper windscreen may reflect heat upwards. This is particularly important if you are snow camping of course, but the same screen works well in summer too. Preserving your fuel on longer hikes is pretty darn important, the difference between a hot meal on day 5 and a cold, soaked version.