I'm not so sure mine is a better solution - just free. A friend of mine uses ductwork and the way it cinches up against his kettle it has less heat loss than mine, and so I'm pretty sure his requires less propane. If I did duct work I think I would try to have it end below the spigot, or have a cutout where that would fit through.
Still, I can and have brewed in stiff winds and it simply is no big deal.