I am going to use your map to ask a question directly related to this thread. Can all further hostilities be ceased if both sides agree to give the valley and only the valley autonomy from both states?? They can have free movement between both states and military protection for both but can form their own government like the model based in Kurdish Iraq. The remaining portions will be absorbed into the states they are already a part of.
Gilgit Baltistan to Pakistan, Leh and Ladakh to India, the valley for the Kashmir's who hate the guts of both states.
As for Saichin the glacier can be handed over to the UN with citizens from both Pakistan and India afforded free trekking rights. Whatever profits are made from the glacier (if any) can be given to the red cross as a joint donation by both Pakistan and India. What is the feasibility of this, or no???