I would add mushrooms to your stir fires for the umami flavor that you're missing with the soy.
AlSo, lime and cilantro and scallions make a lovel sauce. You can do Chinese style without the soy. Moo goo gainpan type things have no soy. I can't find the exact recipes but I would start there.

Made this recently and it was really good -- not sure if he is allergic to peas, but you could easily substitute shredded carrots

http://www.food.com/recipe/honey-chicken-over-snow-pea-rice-177597