DIY wind screen thingy. Probably safe.

I’ll have to look at the Gear Skeptic’s videos again. The windshield that reduced efficiency in some circumstances might have been the one that had a curved bottom reflector. The Gear Skeptic suspected that the airfoil effect was pulling the flame away from the pot.

Keep in mind that Simmershield designed there system to be fuel efficient.  To me, the inlet and exhaust pathways look fairly restrictive.  Note that Simmershield states the following:

Windproof is quite a claim, and we won’t make it. No adventure stove works very well on an exposed ridgeline in a howling gale.

SimmerShield performs better in the wind that a lot of other options, but for best performance you should still try your best to shelter it behind a windbreak (a shrub, log, rock, pack, your body, etc.) when possible.

They also mention that the stove should only be operated at a low flame setting.