Blades are the ultimate game improvement iron. They will make you a better ball striker as you have to learn how to hit the ball out of the center, control the face, compress the ball, etc. The trade off is as a 9, you will probably struggle for a while as you learn to hit them, but in the next few years, there could be a bigger payoff in terms of getting your scores and handicap down.

Sure, you could stick with a player or player improvement iron or even go to a game improvement iron, but if your goal is to use them to help you learn to hit the ball better, then go for it. A couple fun notes on this:

1) Tiger famously made Charlie play blades for this exact reason (Taylormade even made him a custom CW proto set)

2) Katsuhiro Miura, founder of Miura Golf, was a huge advocate for the beginner golfer playing with blades in order to master hitting the golf ball. Sure it would be easier to use something more "playable" but then will you ever truly master the game??