Ships are constantly on the move. S-400 is static when deployed. And we've no confirmation if S-400 was destroyed or not. But SEAD mission was still a success since they had to relocate.
I like how you assume that quick sink is a standoff weapon,
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Our jets need to launch I-Rek way inside Indian Ships SAM coverage. Secondly Modern Fire Control Radar know how to differentiate between some projectile gliding at very low speed and cruise missile coming at them.
Your best bet is SPJ equipped fighters and long range decoy drones with ramjets to overwhelm their defences.