I have a 13 yr old who is a nonvocal communicator. He communicates with a speech generating device and some sign. His communication is not, however, anywhere near that of a child his age. Years behind in fact. I asked these same questions several years ago on another homeschooling forum I frequent. Although there was no one with specific experience, I was encouraged to look into materials geared toward children who are deaf. We have not reached the educational stage where this would be necessary for him (we are still working on ABC recognition) but I think it is an excellent idea.