Since you seem knowledgeable about the subject I want to ask a couple of things:
What if you land a scholarship on your own? For example if you get Fulbright does the Ministry support you and your family financially and in term of obtaining visa, work permit for spouse etc?

Also if you choose to be posted in Karachi/Lahore/Quetta/Peshawar does it affect chances of growth given that you are outside the mainstream?