There is very little chance that India knows with enough certainty where all the Pakistani nukes are to risk a preemptive strike which might be answered by a well hidden Paki nuclear tipped rocket.
Remember, on the last day of the Gulf War Iraq was still firing SCUDs. With every US satellite, recon plane, SAS troop etc looking for them, they continued to evade detection and fire.
My suggestion is a far larger scenario, which may include a preemptive strike by the Indians against the Pakistani nukes. I would speculate an all out war between Pakistan and India, including nukes, and conventional weapons as well. I may have been a little quick to suggest full support from the U.S., Russia, and China, however under your scenario the cat would be out of the bag so to speak, and I could conceive that it would lead to the "world war jihad" as you described.
You seem to forget that India could lose 200 million in a subcontinent Nuclear exchange and still have over 800 million people. If Pakistan loses 200 million, she is annihilated from this earth.
India wins every time.
Only after passing the last signpost and finding themselves in the midst of Mordor will they begin to recognize where they are. Look how many signs have been blithely ignored since Lebanon.
Free nations have the choice of beginning WWIII on top or winding up on the bottom.
Their present actions are not encouraging.