Ginny,
Are you aware that General Mills has transformed some of the "Chex" breakfast cereals into GF offerings. Rice Chex, Corn Chex, and at least a couple of others, are now GF. Always check the label, to be sure, of course, but all of the old stock should be long gone from store shelves, by now. I know that Rice Chex doesn't contain any of your listed allergens, but you would need to check out the labels on the others.
Tex
Gloria
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