You can try time.ahnets.com which is stratum 1, but not in India.
Not sure if this is viable, but you can make your own for very little money.
RPi based NTP stratum 1 servers are popular, I have several. Finding an in-country site with good Internet service to place the NTP server would be a challenge. Also, there is no budget.
As I mentioned above, I’m now running an AWS VM in Mumbai. This has connectivity with NPL India and the AWS provided local time sources