My favoured solution for selfish purposes and the best one- Northern Areas, Azad Kashmir, Kashmir valley to Pakistan. Jammu and Ladakh to India. Siachen Glacier vacated. Aksai Chin- not sure.
Most likely- Azad Kashmir and Kashmir valley 'autonomous' but India and Pakistan can share resources together, NA to Pak, Jammu and Ladakh to India. Demiliatarise most areas and render LoC irrelevant
Sounds great, but India would never allow it as they refuse to even admit that Kashmir isnt a part of India...