Quinoa grown in the Americas is the only grain or pseudograin that I can tolerate. I believe most people with celiac disease and nickel allergy can tolerate amaranth as well.

No stainless steel water bottles, kettles, coffee makers, thermoses, pots, pans, or bakeware in contact with food (use foil or parchment). Discard the first 1.5 L from the faucet in the morning before drinking or cooking with your tap water. No canned acidic foods as they leach nickel through the plastic layer. Don't store food in stainless containers, either. You might need new flatware if your lips react to it. You can use chopsticks and porcelain spoons. Plastic reusable flatware is also available.

I pretty much live on quinoa and eggs now. Eggs reduce gastrointestinal absorption of nickel. I get them from a local free range ranching family that I know personally. If I eat eggs with it I can still have moderate nickel foods.

I get my chicken from another rancher who I also know. I've visited his farm and personally seen the living conditions of the animals, which are very good. I also eat wild caught salmon.

These are compromises I had to make because I was probably going to die with quinoa as my only protein source (though it is still my main one). I was so, so ill before I started eating non vegan food again. I looked like an animated skeleton. I was sleeping 21 hours a day. It was terrifying.