app to delay audio from the phone microphone and bluetooth feed to 'bone conduction headphones' May work?

>Auditory processing deficits have also been proposed as a cause of stuttering.

Stuttering is less prevalent in deaf and hard-of-hearing individuals,

and stuttering may be reduced when auditory feedback is altered,

such as by masking, delayed auditory feedback (DAF), or frequency altered feedback.

There is some evidence that the functional organization of the auditory cortex may be different in people who stutter.

Stuttering : https://en.wikipedia.org/wiki/Stuttering

Delayed Auditory Feedback (DAF) : https://en.wikipedia.org/wiki/Delayed_auditory_feedback

Bone conduction : https://en.wikipedia.org/wiki/Bone_conduction