AHC: Make Twelver Shia Islam the largest religion in the Indian Subcontinent

India and Iran have a lot of cultural ties. So I wonder, what if the largest religion in India was Twelver Shia Islam? Doesn't have to be a majority. Bonus points if you can get a Hindu Iran to exist as well.
 
A toughie, but I think the Bahmanid Sultanate in the Deccan were Shia before the Iranians were if I'm not mistaken. This is a period of Indian history I know very little about though, so I'm not sure how plausible it is for them to spread Shi'ism in the rest of India. If I'm not mistaken, weren't the rulers of Awadh Shi'a as well?
 
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