The idea of using a heavy twin engine platform of deep strikes against Indian heartlands is a valid concept, but given Pakistan’s, to put it mildly, miserable economic situation, I would say instead of expensive aerial platforms firing high value munitions, Pakistan should resort to more asymmetrical means, specifically long range kamikaze drones like the Shahed-136.
Given India’s heavy reliance on foreign munitions and components for air defence systems and a traditional lack of inventory depth, I’d say a large fleet of cheap and expendable drones would be a much greater deterrence as it would constrain India’s resources aside from inflicting damage, without breaking Pakistan’s bank in the process.
Unlike PL-15 and CM-400AKGs, PL-17s have yet to make much public appearances left alone being offered for export. That and, from I learned from open source and speculation, to make the most out of PL-17’s performance would require more than support of friendly aerial assets like AEW and ELINT, but also satellites and other space assets, which means a current NATO-Ukraine style intel sharing that China may have irks about given their traditional pledge for a non-interventionist, non-involvement policy (openly at least)
That and new inventory is expensive. I don’t see the PL-17 being urgently needed for the foreseeable future