Substitutions for Wheat Flour in Pie Crust
I'm going to assume that the primary question is "How can I make a flaky pie crust without wheat flour?" Note that recipe requests are off-topic on this site, but substitution questions are on-topic.

The key thing which wheat flour gives you is gluten. Quinoa is gluten-free, so it's not going to help you much. However, there are ways of making gluten-free breads, cakes, etc. The first hit which Google gives me uses cornstarch, xanthan gum, and gluten-free flours. The second uses arrowroot starch, xanthan, and gluten-free flours. Xanthan isn't the only way of substituting for gluten, but it seems promising.