Also very unlikely that Jammu would be ceded to Pakistan entirely by India. I think Jammu and Kashmir would likely be partitioned between the two, with accompanying population exchanges.
In terms of Bangladesh; East Pakistani Hindus were dispersed throughout the country so weren't concentrated in one area to be able to form a secessionist state, just not going to happen. Most of them would be forced to flee to West Bengal in India as refugees (as happened IOTL) as they don't have the numbers, ideological history or regional concentrations to start an effective insurgency. Plus they would most likely overwhelmingly support the secular Mukthi Bahini - again like IOTL. That's not to say that a Hindutva nationalist India wouldn't annex territory from Bangladesh, just that a separatist East Bengali Hindu state is not viable.
I also don't see Jamaat E Islami (aka razaakars, Islamist collaborators and traitors) gaining enough popular support to start widespread domestic anti-Hindu riots in an environment where the Pakistani Army is cracking down and brutalising East Pakistan. In IOTL the Jamaat/razaakars had the state backing of the Pakistani military (who directed their genocidal mass killings of Hindus, intellectuals, freedom fighters, etc) - they were not a mass movement at the time, (unfortunately they became popular and gained a bit of mass support later after independence, but this would not happen during the years of rebellion when Pakistani troops are slaughtering Bengalis by the droves).