The most practical way in my opinion will be e to create unmanageable unrest into Pakistan so that there army cannot manage it. It should be imploded from inside. However, it is very easy to say than done.
The best way execute it is to keep US in the loop and convince us lawmakers and deep state in particular to do this. If we are able to convince US lawmakers that the United Pakistan is not in the favour of either India US on the world , then this work can more easily be done by using the US influence in the Pakistan by using US influence on Pakistani generals and bribing them. If this can be done then the work can be done with minimum Collateral Damage otherwise other ways are costly and comes with lots of Collateral Damage. When the Pakistan has become the the danger for the whole world , why should India alone pay the price to controlling and dividing the Pakistan. It is not a wisdom. Therefore, a coalition of India, US, France, UK and Israel should be made to see that it happens in a way in which it can be done without too much of Collateral Damage