You are right about the geography bit . An objective analysis of the 71 war between India and Pakistan and the role of forces on both sides in hostilities in the eastern theatre of the conflict alone is sufficient proof of this. Lt Gen Jacob , under the auspices of Gen Manekshaw , devised his plan of bypassing major fortifications and selectively engaging Pakistani corps , which was so successful. That Bangladesh topography can be used to extreme advantage by a guerilla force is well known due to the several rivers and rivulets and is also well documented should you refer the book by General Jacob -- "Surrender at Dacca: Birth of a Nation" .
As far as the bold bit , I already remarked in my previous post that chances of an Indo-BD conflict are minimum because of the strong lines of diplomacy between the two . Furthermore we are no Israel to subscribe to the policy of " maximum collateral damage to teach a lesson" mentality , a trait while morally praise-worthy , is oft mistaken for a sign of weakness. Aside from International condemnation , there will be an intense opposition to any such move from amongst the Indian public too . Despite what bickering we see on PDF , there is a significant amount of public sympathy and friendliness for Bangladeshis in India even today.
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Very unlikely given that Kanchen armour was developed by the DRDO for exclusive use on our Arjuns. No news that the tech was ever shared with any other nation.