If you can internally move to the deal making group within EY, that's the best break you will get. If they require something, a CFA level 1&2 is a relatively quick fix with your job intact. Assuming you are good with CA stuff, it will be a breeze for you to clear CFA 2.
MBA: Post the course, you might have to start afresh, campus placements are a hit and a miss, too much chaos; your batch will be 6-8yo younger to you in India. And MBA isn't a sureshot guarantee of a finance career, esp in 2024 where jobs are hard to get.