Any thought to making their ideas (or hell, most of the Indian idea sets - recent changes have mostly weakened them!) not completely awful? The generic 'Indian Muslim' ideas are one of the most appealing sets in the region now!
While reading a little about Maratha on Wikipedia yesterday I came across the idea of Hindavi Swarajya which I thought would make for an interesting triggerred modifier or decision (like unify Islam).
The goal would be to have all provinces in India controlled by Hindu nations who have an Indian primary culture. Haven't thought too much about what would be an appropriate bonus.
A more dynamic way of doing it and which would make it more relevant for ai would be to scale the boni according to what proportion of India is controlled by 'Right culture' Hindus.