A full sized CATOBAR carrier is unavoidable if you want to be a serious naval power. More than the construction of the ship though, I'm concerned about the aircraft procurement. We've only managed to get 36 new fighters for the Air Force itself in the past 10 years. The cost snd procurement time for 57 modern western fighters for the navy will not be pretty. And this is when most countries with carriers are already moving towards 5th gen jets.
Secondly, I'm not seeing any plans for rapid expansion of the destroyer and submarine fleets, without which you cannot have enough ships for 3 carrier battle groups, plus enough ships for other duties. Even if 1 carrier is always in maintenance, the present number of destroyers including planned Vishakapatnam is not enough. And then there are the replenishment ships like tankers, which we will also need to procure more of. We will enter a Royal Navy situation where they bought 2 carriers but don't have enough ships for 2 CBG's, nor enough planes for the 2 carriers.
There are many elements in the navy which need to come together before a 3rd carrier makes sense, and I'm not seeing these other elements going in a satisfactory direction or speed.