I'm about to embark on the same adventure, but we have so many predators around (coyotes, bobcats, raccoons, hawks, owls) that realistically the hens will have to be cooped up unless I'm outside with them.
I'm considering using this feed: Scratch and Peck Feeds | Chicken Feed | Turkey Feed | Goat Feed | Pig Feed | Bellingham and Whatcom County
I don't think they ship....but it shows that there are feeds around that have no soy and no corn. Maybe if you contact them they'd know of somewhere in your area that produces a similar product?
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food