My understanding is that to an extent during the Company Raj, the Anglo-Indian community, and the Anglo-Burmese was effectively created through mixed marriages between White soldiers/Company Men and Indian Women.
This practice was later banned by the British Raj.
What if we take a different turn, and have the Company, and then later the British Raj not just approve but actively encourage this, with logic of your choice over race - but with the aim of hiring the Anglo-Indian Community to be the Backbone of British Indian Rule - forming the clerks, the police, NCOs and low-level officers in the army.
What sort of impact could that have?