Could they not be considered reasonable representatives of Peshawari Pashtuns, if that's the case, in your opinion? Is Peshawar itself not host to a sizeable Hindko community?

I do not doubt that one bit. The maintenance of tribal lines for generations complicates the usual geographic and ethno-linguistic trends one would normally expect (e.g. SW Asian increase further southwest you go in Iran). It'd certainly have an impact, although the underlying question is, by how much?

Which tribe did you belong to again, Karachi? I recall you stated your ancestry might possibly be that of "Pashtunized Dards"? Please correct me if I'm wrong in that regard.