I'll let you in on a bit about Siachen. PK intel reports from a few years prior to Indian occupation of Siachen informed our military planners of Indian Scientific posts in Antartica where soldiers were being sent (limited numbers). PK Mil could not put this intel together in time that this was a precursor training for Siachen. In terms of Siachen, till Indian occupation that part of LOC was not monitored/manned throughout the year. PK and IND would come to their their posts in Spring and Summer. Rest of the year that part was left unmanned. This cycle happened every year till the year that when PK went to occupy their posts they found Indians far further in than in the previous years. That is how this (Siachen) began.
In terms of our roles being reversed. I have thought about that. What I know I would be espousing in India (were I in your shoes) would be that the Chankia philosophy of "not friend of neighbors but neighbor's neighbors" is dumb and short termed, but I guess we live in this curse of small minded sub-continent people. That having calm borders/relationships is a precursor to national wealth or regional development. That pushing smaller countries to the limit will change and impact us more than we think in terms of changing our own national construct, and will give rise to local forces that one day can destroy us especially given our own fractures (old saying of people in glass houses). It would also give third parties the ability to come play big power politics. And now in contemporary times, give China the ability to encircle us. It is extremely short-sighted for India to think that a country like Pakistan with 225M people and a land mass almost the size of the US eastern seaboard can be brought under extra-political control.
My approach would have been that as a larger more secure country lets make Pakistan feel at ease with us, even if it means giving it more, because by dis-arming their animus over the long term we'll gain far more. But three things precluded that from happening, the generational Hindu distrust of Muslims (ala Pakistan a poster child of Islam and some correct views of poor muslim rulers in pre-colonial India), the bloody partition and the short minded zero sum mentality. All of these things entrenched our people in this cycle that is now very difficult to get out of. Also Indian's rulers took on a bad policy to start with. Which was that the Pakistani experiment will fail and its failure is a validation of India. By playing regional politics in this way they enabled their own hawks, entrenched themselves into a corner with limited rapprochement options. Perhaps it is the fate of our land, and expecting Indian's to be saints was never an option. So our land might be destined to remain blood soaked with little chance of change for our lot.
The change if it does come, will come from India more so than Pakistan. We are smaller and will always be reactionary and security oriented as we should be.
