[davidgould]

Most gas stove tops in the US are not great for cooking with a wok anyway as they are underpowered and the flame comes out the edges of the "sealed burner".

I use an Iwatani 35FW tabletop butane burner for wok cooking which works much better than my gas stove. It claims 15,000 Btu vs my stoves 7,000. I suspect both claims are inflated, but the Iwatani will boil a pint of water in 1/4th the time of the stove. The wok is acceptably stable on it and the flame pattern is usable if not ideal. The butane cans are well under $2 and will make several meals per can. It's a bit pricey ($100-ish now) but mine has lasted six years of frequent use.