I have never understood this stupid idea of taking PoK or taking GB to get access to Afghanistan. Absolutely crazy. As you have said, these people are too far gone and an additional mess that we don't need. As for taking GB to get access to Afghanistan, that's another daft idea. The best way to deal with Afghans is from a distance. Having them on your border is quite simply a nightmare we can do without.
The best bet would be, we take mountain ranges, the areas from where we get better tactical advantage, can be defended and after that should take some more land as buffer to operate on, other than that everything else is dead meat.
And even if we want more land, make it a fortified garrison with only some exit and entry points (from Indian side), with open field to work on and keep every other side open and take the battle there in that way we can shift focus from Kashmir to POK and let POK take the burdon, and gradually move J&K radicals in POK.
And search for whatever resources or send our politicians to set their shops for mineral resources if any, rest they will take care of.
Same can be done of GB.