I do something like this at home, I have an
$1 and it makes like 3+ inches of extremely stable foam.
I drink blonde cold brew mostly and also make cold brew ice cubes. So one day I put a cold brew ice cube in a cup and topped it with the hot very dry foam. Then poured cold brew down in over the foam and let it sit for a minute for the temperature to stabilize.
Comes out fantastic! Highly recommend.