Umm who is talking about 12 carriers & those too CVNs??I certainly did not.Heck even the USSR at it's height didn't have more than 6 & all were conventionally powered V/STOL ships.The Indian navy plans to have around 3 carriers by 2020 & 4-5 by 2025.Far short of your 12.
We're talking in circles.
All I want to say is India doesn't need a blue-water navy.