With a POD of 600 AD, make the all states in the territory of the Indian Subcontinent governed by strict Confucian principles by the year 1200.
Bonus points if you somehow manage to destroy Hinduism as a major religion during this time period.
Maybe if it spread into Indochina, Thailand, Burma... from Szichuan...
And then, into the east of India, Assam... Asian minorities?
Who would transmit the ideas of Confucianism? Buddhism was spread by merchants (and some missionaries), but Confucianism would have to be transmitted by the educated literati who know how the ideas well. And these scholar-officials are some of the last people who would travel all the way from China to India in order to spread Confucianism.
That being said, I could see some impetus for spreading Confucianism. I think it was one of the Confucian masters, maybe Confucius, who said that a sage could spread civilization among barbarians. This could be interpreted in an evangelical way. Perhaps a scholar-official, who knows Confucianism well but also knows Buddhism and has a knowledge of some Indian languages, gets kidnapped by pirates, fins his way in India, and decides to transmit the Confucian texts to India. Given the fact that some scholars memorized entire texts, this guy could write them down from memory, translate them, and try to spread the ideas.
However, I can't imagine India actually adopting many ideas, except for maybe the concept of imperial examinations.
Confucianism is a philosophy which is very much concerned with a semi-urbanised organised state. There aren't many of these in Assam and Burma at the time.
POD: The conditions for the Anshi revolts are butterflied away in the early 700s.
Result: The Turkic peoples are more heavily influenced by the Chinese. Afghanistan turns more towards a Chinese influenced style of government. When the analogues to the Ghorids roll around, they overrun India and establish a Chinese style Imperial Court in the Ganges River valley.
I think this could work, but the expansion of Islam into Central Asia might have to be halted. If you get rid of the Anshi revolt but the Battle of Talas still happens on cue, then you might not have Confucianism in Central Asia.