Haha, i am not a JDM lover- i myself have a Swift. Mehran or civic or prius- it depends on the person buying it. I needed a small car with okay-ish looks and fully loaded- i got Swift. next time i will inshAllah get a fuel efficient car but a bit bigger- Prius.
If i wanted a car i could use when shopping in tight places and could afford it being hit by bikes scratched etc- Mehran.
I am not against JDM or PKDM- it's all about preferences! I like Coke- Pakistani made, you might like Cherry Coke or Vanilla Coke(Imported).
And yes, Mehran could be exported. But it would have to compete with the price tag of Tata Nano.