@Cregan , the scenario you have given is simply not possible. Pakistan would never want to have Punjab which now resides in India, if they insist on doing so there would be war. Patel would never, ever allow such a concentrated muslim area (East Pakistan) into India. Note that Kashmir was actually not on the plate either. Patel, at best, wanted to keep it hanging in the balance to force Pakistan away from engaging in stupid shit like separation of Junagarh and Hyderabad (today mostly in Andhra). Not that they would have survived as they were being surrounded completely by Indian territories.
Kashmir came to be as it is because of the 1948 clash, with Patel finally asking : ' Jawaharlal,do you want Kashmir, or do you want to give it away?' Any Indian leader would not allow Jammu, Ladakh to fall way to Pakistan.
I didn't give any such scenario, the OP suggested it and I replied that trying to incorporate all of Punjab and Haryana into Pakistan, and East Bengal into India, was unfeasible and would result in religious insurgencies, ethnic cleansing and ongoing communal violence on a largescale. A very bad idea all round.