Old wryneck injury?

[Littletrees]

I have house birds, they won’t do well with my flock due to wry neck from when they were chicks. We do the necessary treatments, the symptoms don’t progress and they are (for lack of a better word) thriving and enjoying life but they still have crook necks. They can be manually straightened out with ease and no signs of discomfort. Neither were hatched with it. They’re both rescues. Is there anything I can do to straighten them out? They’re both young still I just worry about them.
*they’re both coturnix quail but chicken advice or experiences are helpful too!

 

[Rose the Legbar]

@Eggcessive