Important note #2: assumptions.
-no third parties, but western powers remain blind to Indians playing sea control games.
-third parties remain neutral and unoccupied, but also retain their current political stance(Pakistan clause);
Overall concept: IN deployment will be as follows: Forward position - sea denial assets deployed to chokepoints; Andaman position establishes control over the battle area; Battle fleet as a reactionary force; Rear formations exploit local sea control to the fullest. All that trying not to use too much IAF fighting strength (they'll be busier elsewhere), and somehow keeping eye on Pakistan.
This is you:
"Here's my grand Theory of Everything, and my only 'assumption' is that it has no basis in our actual universe."
1) If ever there was a kinetic conflict over the Malacca straits, it would automatically involve "3rd parties" by definition.
2) India would never launch anything like that alone, it would be a minor member of a US-coalition
3) 1+2 = World War 3
Now, leaving the Malacca Straits aside (because that doesn't even belong on this thread for the above reasons), any major war between China and India will result in Pakistan entering the conflict, and it will escalate into a full spectrum war. This is a fact that every Indian military planner already knows. So any operational plan ignoring this strategic reality is dead-on-arrival.