you seem to know the area well : quite hard to get tyres in pakistan, india ... especilally new ones, you might get second hand ones if you re lucky
coming from europe, your best chance is still before pakistan (iran and turkey for example) and after india, thailand for example
a few messages under yours in the same page of this forum a few days ago talks about an importer in india :
and if you search on the hubb (use the search function, type your keywords, on the top right of the page), many posts +/- recent, since we all are in the same situation : some experiences, some importers, tyres sizes etc ... are given : maybe not exactly THE thing/solution you re looking for but some valuable help ...
good luck, let us know if you have something new, THE solution, thanx