these look divine!. never buy these gluten free ones u are right, im no expert but u can pretty much make anything into a flour if u have a food processor. I often use coconut flour, any nut flours theres hazelnut aswell and almonds like u used, but any nut. u can use flaxseed flour or grind flax seeds, but the taste is a little strong, u can probably use chickpea flours aswell. i think u can make chia seeds into a flour but not sure what happens to the texture.