Pakistan should try what India did, no joke.
India during the old era when Dhoni came in was actually the opposite.
Their top order was extremely aggressive with Sachin, sehwag, Ghambir and yuvi going bang bang mode.
Dhoni ironically is not aggressive like people claim him to be. He actually took the game deep and finished it, similar to Bevan.
It might be a good idea to have bang bang openers and middle order while the lower order takes it deep and tries to finish games.
It worked for Australia and India. It didn't work for England though