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There are a lot of little talents that a person needs in order to be successful in the physical world, and one of them is a clear speaking voice. If a person can't perform clear native speech (that would be English in the US), he will be handicapped. People who speak well get more respect.
Consequently, part of the education of children should be practice in vocal skills. It seems that a system for doing this may be an opportunity for kids who need extra practice and also an opportunity for benevolent volunteers.
Try this: An organization or club or some kind of management structure sets up half-hour sessions between the kid and the benefactor. Maybe two or three times a week. During the session, it's the kid's job to read aloud from one of the books that the kids are supposed to be reading at whatever grade level he's at. The kid, of course, gets gentle suggestions on how to get better at the quality of his speech.
There may be a bribery angle here, too. Suppose there's a jar somewhere where the kid does the reading, and every week the benefactor stuffs a fiver into the jar. Suppose the program runs 20 weeks, and at the end of 20 weeks the kid gets handed his 100 bucks. So there's a savings experience happening too.