Nice to hear... you are most welcome in Pakistan... and don't simply judge about a place by just reading comments... it's always better to visit the place personally...
The route from Europe to China and India crossing from Pakistan is an ancient and well visited route... During whole year, visitors are crossing through these routes with no issues... (though sometimes a bad incident can happen...)
The northern parts of Pakistan are worth watching and numerous in number... there is a saying that "One life time is less to explore the Northern areas of Pakistan"... (H)
Mostly the route that is followed is Turkey->Iran->Pakistan->India and so on and vice versa...
One good place to get help for such trips outside Pakistan is HUBB... and regarding Pakistan... then this is the best place to ask questions...
Recently i tried to cover some northern parts of the country and here is a brief intro to the North of Pakistan...
https://www.pakwheels.com/forums/road-trips-vacations/172487-pbc-journey-worlds-highest-polo-ground-worlds-highest-plateau