I agree to a certain point the deaf "accent" may not change. But it will help to improve the overall understanding of the speech.
I will always have a deaf accent. But my speech is clear enough for others to understand. I had speech therapy so it has helped
I have a deaf friend who can not even hear a jet overhead. He is totally deaf. And he has learned to speak but he actually Learned to whisper instead of totally using his voice. Almost like he is emphasising his lip reading to the hearing but with a whisper. Strange I know.
He is the only one that I know of that does this and it is very effective when he speaks to the hearing
