I purchased two juvenile/female hoevens wrasses. They grew up together in a 300. Both turned male, and seem to get along fine. Even hung out together. Had to move them into a 33 long, and they got in a fight. They're still in the 33 and seem to get along fine again. They will be going back to the 300 soon.
Female/juvenile hoevens wrasses don't seem to be hard to find. It's not like trying to find female flashers. Your LFS should have no problem getting one in for you. Keeping it female may be the bigger problem.
HTH
Peace
EC