Formating
Having done real formating in a fighter under a bomber in that very area to cover fighter movements between bases while the bomber was on a 'navex' it would not be easy to maintain the very close formation required in a large a/c if exposed to military radar. It very much depends on range. In my case the bomber was roughly twice the area, but I still had to fly directly under its wing approaching the military radars and they were primitive by today's standards.
I'm deeply skeptical that it could be done over India without 2 blips being discriminated and in two large a/c of roughly the same size for 4 hours.