In my opinion, I think the PAF should instead keep an eye on the Antonov An-70. Ukraine is working to revive that program - i.e. upgrade its avionics (via the West) and push into serial production. Unlike the IL-76 and Y-20, the An-70 provides that heavy-lift element (47 tons) in hot-and-high environments (e.g. Northern Areas/Kashmir).
The An-70's success rests on scale. It would be nice to see Ukraine, Pakistan and a couple others - e.g. South Africa, a private Chinese freighter firm, etc - form a consortium for the An-70 wherein they pool orders and split production and support work. If successful, we'd have the poor man's A400M.
For the tanker role, it would be best to find some surplus commercial airliners on the market (e.g. A330) and fit them with two hose-and-drogue pods. Basically, consider working with Ukraine to integrate the UPAZ to the A330. This way, the PAF would get a decent long-range tanker with much better fuel efficiency than the guzzlers that are the IL-78. Maybe consider fitting SIGINT equipment to those airliners too ... so whenever they're up in the air doing AAR, they're also picking up frequencies to add to Pakistan's threat library.