Imran bhai Tabiyat theek hai? Aaj badi sincere baatein kar rahe hain.
Anyways, coming on topic. This can never happen even if we wish to. Let us take calculations. COK2 and Laddakh region is primary Buddhist religion and they prefer safe with India. Jammu is primarily Hindu/Sikh dominated area and they prefer India. Kashmir Valley has mostly Sunnis and they are confused if they want freedom or want to go with Pakistan, Minority Shias are still preferring India.
Now coming back to Pakistan's side, Gilgit Baltistan does not have preference for 'Azadi' so they are happy with Pakistan. Mirpur have more Punjabis than Kashmiri now so they want to go with Pakistan. Now, remaining people from Valley of Muzaffarabad have confusion of either going with Pakistan or having 'Azadi' along with Kashmir Valley. As now there is No connection between Srinagar and Muzaffarabad since few generations then it is very difficult that both group will be aligned.
China is not going to give back COK1 or COK2. Case closed for China.
Now, tell me how this is going to work.