“But it doesn’t help with American oats anyway because they’re cross-contaminated with wheat.”
Which is why I specifically wrote certified gluten free oat flour.
“apushatayid: R’ Schachter is not Meikil for celiacs. He says by celiacs that Ones Rachmana Patrei.”
That may be true, but he is not my Rav. Numerous poskim a)maintain that Oats IS in fact one of the 5 types of grain and 2)maintain that is so on a doraisa level and that someone with celiac may use matza made from Certified Gluten Free Oat flour and make the bracha al achilas matza as well as hamotzi all year long whenever eating bread made from oat flour.
“I just don’t have the industrial knowledge to know what it is in that GF bread that causes it not to be KFP).”
For starters the hechsherim that certify Katz or Udis are those that follow the ashkenazic minhag not to use kitniyot on pesach and probably do not want to be involved in certifying such products. MANY certified GF products contain rice flour or corn flour, and I am guessing the preparations necessary to make a KFP run (cleaning the equipement, etc) are not cost effective.