Why? It’s easier to just invent fusion and get air conditioning going at the national level. Or just paint the entire country white.

India has painted entire cities before! (Jodhpur blue, Jaipur pink)

not everyone might like all white. Instead of entire country we can have dome with climate control over metro city.

Maybe blow some parts of the Himalayas so the cold air can enter the Indian mainland.

If that is done, then the advantages are lost too. Much of moisture from the monsoons is dumped as snow during winter which powers all the glacial rivers because Himalayas act as a barrier for the moisture rich winds. That is why the other side of Himalayas is a cold dry desert (rain shadow).

and let Chinese in? nah.