If it's really quite relevant to the conversation at hand, or answering a direct question, I'll share too. But off topic and out of the blue ... well that's not the right time. Or taking a bold step right into the middle of an already established culture to cause disharmony ... also not the right time.
You mean the disruptive affects both Islam and Christianity had on India?
Not that I'm aware, other than professions where no local person can do it, like temple carvers, or priests who know how to do certain ceremonies. Then it's on visas. An exception might be ISKCON though, as they follow similar patterns to some Abrahamic proselytising groups. They do go all over.
Having a Priest move from one locality to another would be an important step in either establishing or strengthening a Hindu community. The Priest was pivotal to the Hindu Pooja I recently attended.
While ISKCON is at one end of the spectrum and your group may at the other, there are undoubtedly other Hindu groups in the middle such as the Brahma Kumaris or Sai Baba.
http://www.brahmakumaris.nz/about-us/introduction
We've been through the exaggeration stuff before, and I'm not willing to go there again. I researched Canada, and discovered ghost towns to have Baha'i communities. Enough said. From my research from non-Baha'i sources, (not ex-Baha'i but government data) I concluded that the data is grossly over-exaggerated, probably by a factor of about 5 times. You're free to believe the Baha'i propaganda.
To be clear the only two countries with reliable census data (Canada and Norway) included in a Wikipedia article mentioning criticism of Baha’i statistics has a much smaller difference between official Baha’i figures and census numbers, so I have no idea where your estimate of 5 times comes from.
Criticism of the Bahá'í Faith - Wikipedia