Hi cobble, I've little knowledge about ASD, just wish to share the little I know:
- young children need not learn speech from other young children. Their best teachers are their parents. You may seek help from therapists, and read on the ways to help your boy personally
- When my boy started attending Shichida weekly lessons, the principal did mention something about autism. I've also seen several children with Down Syndrome attending classes. I read that right brain education can help children with special learning needs. You may find out more from Shichida centres. If you can read Chinese, there are books at Popular Bookstore, translated from Prof Shichida's works. His name is 七田真.
Generally, the Shichida Method needs daily practices with the child.
Many special needs children are actually gifted in their unique ways (e.g. photographic memory, musical prodigies), they simply need a different learning method from so-called normal children.
There are many limitations in mainstream schools even for the average child.
One parent I know in KL has been homeschooling her special child for 6 years. He's mildly autistic yet very fast learner.
Hope you can find a solution soon. All the best!