If you don’t want to use wheat at all and want the full flavour and nutrition of the non-gluten flour you are using, the modernist solution to the problem is xanthan gum. It’s a surreally powerful thickener that adds no flavour of its own. The best part is that you need a really tiny amount. In fact, a small pinch of xanthan gum can help you make millet rotis that do not break up like the Balkans.