Good questions. I think Jacob did enjoy India, but can’t see himself living there. He probably doesn’t handle culture shock very well in my opinion (there’s no evidence to back that up, obviously). The two were born and raised in a fairly small town that went to one of the largest cities in the UK on the whim after all. I’m not saying that Evie didn’t experience such thing though, but she had Henry and more time to adjust to a vastly different country. However, considering the period the game takes place in, I’m sure India would’ve been wary of her, an Englishwoman, settling in their country with an Indian fiancé (which sadly, is sometimes still the case even today, but let’s not get into that).
However, I doubt the Indian Brotherhood would feel the same because if Jacob and Evie truly are the “Unstoppable Frye Twins”, their success in eliminating the Templar strongholds in London would have reached all the Assassins around the world. I’m sure the Indian Brotherhood would be more like, “ HOLY SHIT. IT’S DAME EVIE FRYE!!1!1!” It’s also implied that they welcomed Henry back into the Brotherhood when he returned.