I didn't mix Z and Parsi. I didn't even mention Parsi. I just can't find anything online which suggests Indian Zoroastrians accept converts. Just (dispassionate) explanations that they don't. And that's fine with me.

I've no doubt that there are some deracinated Parsis in the West that claim that "nobody minds" in order to make Z fit in with other religions. But that strikes me as almost a form of group suicide. If you feel that way about other groups it would end with their erasure. Why not just concrete over North Sentinel Island and turn it into a startup hub?