A Mixed Defensive/Offensive Force Should be build
The Goal is blocking enemy forces from taking or maneuvering through Pakistani Territory to pressure the state in other areas
The bulk of the force should be an asymmetric blocking force; getting inside the OODA loop of any potential force (which could mean marine operations such as espionage deep in enemy territory over a prolonged period of time to know in advance how an enemy will maneuver, and thereby be best able with least effort to blunt if not repel the enemy, and bog down their force in a side show)
cheap unattended ground and underwater sensor grids, dual purpose built development in the ran of the kutch to serve as a civilian infrastructure in peacetime and a military fortress in times of hostility
guiding precision fire from assets over the horizon, such as mobile artillery or sensor fuzed weapon on cheap cruise missiles to destroy armor thrust
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on the offensive side; the marines can go behind enemy lines to destroy enemy mobilization assets, fuel and ammo dumps, spare parts and repair depots, fiber optic cable between headquarters units on the front lines; or better yet hack the networks to spread disinformation and false orders (none of this requires the latest equipement, but ingenuity such as the Vietcong, Hezbollah, and us forces in exercise Millenium Challenge 2002 under general Van Riper)
a good documentary to watch to understand how a large conventional force can be easily derailed
for a smaller asymmetric force sowing chaos in a larger conventional enemy and buying time can be half the battle