Your wish need a position of strength viz a viz Pakistan + China combo, and I do not see India acquiring the same in near or even distant future.
TBH we have far more open cracks to be exploited than the rivals.
Sorry I need to be realistic in my approach.
Only solution is (if at all we need PoK back at all cost)-
1. Take a loss in eastern front, make allies with China against western block.
2. Offer China passage to Arabian sea in case India ever regain PoK and GB.
3. Press the peddle on Pakistan, go salami slicing while balancing the N threshold.
4. While doing #1 to #3, keep internal right wing extremism in check. You can't have societal disharmony and imbalance while trying to expand your boundaries.
1 is impossible. India's and China's views are completely divergent for any alliance to work.
2 is entirely against our interests.
3 works entirely against Chinese interests, which is among the reasons why 1 or 2 are impossible.
China wants a subservient and broken India. So 1 and 2 are unlikely to ever happen within the current environment, and this is even if we forgo most of our interests and become subservient. We are far too divergent in views for it to work, since China sees our democratic system as an existential threat to their one-party system's survival. The Chinese need India to fail. India, and the West by extension, wins the moment the Chinese people see the advantages of democracy over communism.
4. Right wing is the future of India, whereas left wing has proven itself to be a complete and utter failure. As for extremism, we need to put curbs on its potential for violence, but we need a full consolidation of the right wing in India in elections. We need an India that fully converges towards national pride and national security, and everything else must be relegated to the side, otherwise India's future is going to be very dismal. With left wing, our future is guaranteed to be dead, and we know that for a fact already.
As for strength, we have it with respect to Pakistan. And we do not really need it with China. But what we really need is a distracted China, which means we need the Americans to be aggressive with China until such time we get the needed strength to face them on our own. Since we are not alone, we are not under pressure to police them ourselves.