Hi Roopa! Yes. As long as it is a wheat flour (maida, bread flour, atta), you can switch between different flours for feeding. Always make sure your flours for starters are preservative and bleach free. And always preserve your mother starter and feed that with a consistent flour and you can try different flour feeds for different breads and results.

Hi Anthony! Yes absolutely. You can either build the levain over two steps and use maida (make sure it is preservative and bleach free) to feed or just build a levain with Indie (like you always do). The only difference being, if you choose to do the later, there might be some difference in structure of the focaccia (nothing major though).