A useful program Pakistan can work on is rebuilding its Shorter Range Missiles like Shaheen 1A with modern materials. Its a 12 meter long 1 meter diameter single stage missile. If its casing was made with modern a carbon casing and used modern propellants, an externally similar missile could have 2-3 times the range as before.
Then adding in the Chevlaine decoy enhanced warhead or Boost Glide warhead for dodging enemy ABM systems can really make a small very mobile system even more deadly. India wouldn't be sure with the system was a regular Shaheen 1A or an enhanced version. Then building 50-100 of thee missiles would tie up their intelligence agencies chasing to make sure they can do a successful counter-force first strike.
https://en.wikipedia.org/wiki/Shaheen-I
To Visualize What this missile would look like the exact same dimension 39 feet long and 40 inches diameter look at the cancelled US KEI missile. This is the exact same dimensions as the Shaheen 1A and you can see where Pakistan can really go with modern materials and propellants, and was turned into a 2 stage missile.
https://www.globalsecurity.org/space/systems/images/kei-sm3-image01.jpg
The Shaheen 1 only has an apogee of 100 km.
http://www.astronautix.com/s/shaheen1.html
While the KEI, altough an interceptor has an apogee as best as i can determine of 700-750 km per this graphic (Someone can correct me if i'm wrong)
https://www.nap.edu/openbook/13189/xhtml/images/p27-01.jpg
mass is only 7500kg
https://image.slidesharecdn.com/ant...allistic-missiles-ii-20-638.jpg?cb=1439480678
more information:
https://www.tonyrogers.com/weapons/kinetic_energy_missile_interceptor.htm
Its advanced propellant allows it to reach
6 km/sec speed after only a 60 second burn up to an apogee of 700-750 km; or fast enough to intercept an ICBM.
Range if turned into a ballistic missile could be
2200-2400 km. (I'm not a rocket scientist so someone will have to check the math).
Here is the calculator I used
http://www.convertalot.com/ballistic_trajectory_calculator.html
Also its 1 meter diameter makes it perfect to be turned into a SLBM for the PN.
BTW the following video can show you what a Canistered KEI version of the Shaheen 1A would look like