I use the outer ring of an old Caldera cone for a windscreen. Let me add that I use it only for solo cooking, where a boil might take three minutes. I check the warmth of the canister often and have never found it to heat up to any degree with this system.
I may be wrong, but it seems that this system adds warmth to the pot as it’s heating, as well as providing 360% wind protection. Of course, I still position my cook pot behind any available or constructed wind barrier in windy conditions.
As an added bonus, if my canister were to fail, I could still use the Caldera wind screen along with metal tent poles to support a pot of water and build a wood chip fire beneath for a boil. The Caldera has slots for exactly this purpose. And yes, those slots allow a mixing of fresh air into the canister, along with air coming in from below.