What is wok air?
~~You should never get a nonstick wok. They are meant for very high heat applications which is the opposite of what nonstick is for or even safe for.~~ Nevermind wrong nonstick
Is there any reason you are against stainless or cast iron? Amazon has this stainless one for a very good price
For instance, is this bad?
Super UL would the aluminum pans (non-anodized) that go under a water heater to catch and drain away any leaking water. 20" diameter is the smallest I've see listed: https://www.homedepot.com/p/Eastman-20-in-Aluminum-Water-Heater-Drain-Pan-60080/313015598?MERCH=REC-_-pipsem-_-309163036-_-313015598-_-N
I got one for a friend who was evaporating birch sap over a wood fire (so it always had liquid it in and hence, immune to scorching).
I just checked a 24-diameter one and it was 2.05 pounds. Suggesting a 20-inch-diameter one would be about 1.4 pounds.
They come with a hole in the side, but the hole is sized for pipe. I'd use a short pipe nipple, an end cap on the inside and an electrical conduit locknut on the outside with high-temp gaskets both to plug the hole and also to create a handle. Or just JB-Weld some sheet aluminum (energy drink cans are thicker walled than beer and soda cans) over the hole.
The same guy who was processing birch syrup once brought a steel paella pan 9 miles in on a father-daughter backpacking trip (5 dads and 6 girls in the same middle school posse). It was 20 pounds or so, but he chalked it up to training for a mountain goat hunt he had coming up.
If the water-heater pan seems too flimsy (it would have to be well-supported on a fire pit grate or something), maybe consider a cheap wok. Pressed out of steel, they take high temperatures, and have sturdy handles on them already. They are available in anodized aluminum but those are heavier in 11" diameters (6 pounds shipping weight) than the steel ones are 14" (4.4 shipping weight).
Or here's a 14" stainless one for only $39: https://www.amazon.com/Cuisinart-726-38H-Classic-Stainless-Stir-Fry/dp/B000ND3GQY/ref=sxin_9?ascsubtag=amzn1.osa.e939dc30-63be-43cc-9bb9-2f4c11f4e899.ATVPDKIKX0DER.en_US&creativeASIN=B000ND3GQY&cv_ct_cx=wok&cv_ct_id=amzn1.osa.e939dc30-... Leaving the lid at home and bringing aluminum foil would save weight.
But a wok from a dollar store or eBay or at Walmart would probably be even thinner and lighter.