What you are talking about is old generation post boost vehicles which carries around all warheads on a single MIRV bus. This is not enough to fool a modern ASAT. Even satellites can switch orbits and the DACS can easily make all the manoeuvres necessary to compensate, so you can expect our ASAT also to be prepared to handle such manoeuvres.
Point being, your warhead and decoys will not be performing complex enough post boost manoeuvres if you are only bringing in the tech from the Minuteman or Trident.
More importantly, your missiles are yet to show off post boost manoeuvres. Maybe we can expect one on Ababeel, but I won't be surprised if it's only at Minuteman level.
What I'm talking about and is more interesting is the independent post boost vehicle, which other countries are still working on.
Of course, considering the distance between India and Pakistan, it would be more interesting to see the ASAT killing the missile before the post boost vehicle is deployed.
Just a heads up, if you are referring to countermeasures invented in the 70s and 80s, you can be sure our scientists have already catered for such measures. This much should be obvious.