Interesting point about range-fed meats. Many - most, really - meat animals here in the States are fed soy as a large portion of their diets, and corn as well (corn can also be allergenic!
) so it stands to reason those proteins would be in the meat. (Chicken, too, so in the eggs.)
That diet actually looks really good to me, and I'd probably also go easy on potatoes as they're nightshade veg (like tomatoes, peppers, and eggplants) and can trigger reactions in sensitive people; sweet potatoes aren't related, though, I don't think.
If you go on this diet, you HAVE to make sure you get "good fats" into your diet or you will be RAVENOUS. Coconut oil (fine at any temperature, can even eat it straight! Best for high-heat cooking), olive oil (low-heat applications only), flaxseed oil (ditto), fish oil when you add seafood in again (also ditto). Ghee/clarified butter is tolerated by some dairy-sensitive people since it has the milk proteins removed, but I'd take that out at first as well to give dairy time to clear your system completely, since even hidden trace dairy can trigger reactions. Do be careful with rice milk, BTW; I had been drinking one with carageenan in it and that caused Nat's pops to turn spinach-green; when I removed it, back to normal, tried that brand again and back to green, couldn't use it for a few more months without issues.
Does it feel weird to eat that way? Yes, for sure, but remember that before mankind had farms and grew grains, there was only meat, veg, fruit to eat plus whatever was foraged like eggs and seeds and nuts, so it is possible.