Would you get new clubs if you were working swing changes?
Listen to Mr. Jones!
It makes sense and not just because I buy way too many clubs than I probably should. Think about it....you are implementing swing changes, why not get the new clubs now instead of implementing the swing changes and then getting new clubs and then having to adjust again?
I think you can go either way on this ...
I bought some cast clubs at a good price so I would not wear out my expensive forgings during the process, which is taking longer than anticipated.
I would stick with the CB's until you feel confident with the changes, and then get fitted for the new irons. The new swing may cause fitting adjustments that aren't incorporated into the CB's. Your swingspeed may change during the process, etc. So, I'd wait, get fitted, and then buy the new ones as a reward for going through a difficult process... swing change.
Keep the old clubs and spend all the money you save on balls. I prefer to tee off on every hole of every round with a brand new ball. It's a feeling akin to manfully donning a pair of clean, lightly starched cotton boxers in the morning after powdering your (other) balls with Gold Bond. A great fresh start -- to a new day, to a new hole*.
(* The one on the golf course. I don't powder my own. You really need to watch out for zinc oxide infiltration.)