I wonder how much of this is our jugaad mindset at work. Since apart from the Scorpenes, the Only certainty regarding future induction of subs is that there's no certainty about prospective timelines of such inductions. We've certainly come up with some smart ad hoc measures that other nations experimented with in the 80's & 90's but didn't proceed with.
I suspect a great deal of the success of these systems would depend on the inputs we receive from our Quad partners since our own platforms whether air, sea, submerged or ocean floor based would be inadequate to tackle the Chinese ( this isn't aimed much at Paxtan, although towards the end of this decade given the sheer numbers of subs they plan to induct , they'd have to be factored in as well).