If you want to get a new sim for every trip, Jio might be better. Their process to get eSim at least in Mumbai is super-smooth. Although, they too have their arbitrary rules too - eg: They won't let you change eSims unless you're physically in India.

I'm also a bit surprised you can't add the email address while creating the account. Might be some extra work to get their agent to do this, but might be worth the hassle if it saves you the 2 days.