AHC: British Empire Turns Indian

Interesting points. I wonder if there's an opportunity for a place like India where no one ethnic group has a majority, unlike Algeria? The British did expand the vote (albeit with limited powers) to the assemblies in our timeline.
I'm not sure how it complies with your idea to have Indian Presidencies gaining parlementarian vote : by the end of XVIIIth centuries, these were arguablr rather limited territorialy and roughly homogenous ethnically, except in Circars.

When British India becomes larger (and the ethnicisation of the territory becomes a thing trough colonisation, at least partially) you'd have more diverse territories but less chances to make it turn early to partial access to British institutions.

I could see, however, an equivalent to the old communes of Senegal (the english article is somehow incomplete : if you can, go for the french version for the late XVIIIth), complete with pitfalls and obstacles, within the frame of British India.
 
Top