Without knowing my son had AS, but believing strongly in a second language, we enrolled him in a full-immersion Spanish preschool, and then in a two-way-immersion English/Spanish elementary school.
I had no idea there would be secondary benefits, but later on, I realized that he learned to read emotions because all his teachers were so much more animated and expressive nonverbally to help the children catch on to the language they didn't know. It also helped my son stand out less, as most of the other kids struggled to understand the teacher, too.
However, after eight full years of Spanish immersion, my son speaks about seven words of Spanish. I assume it's all inside that big brain of his, waiting to get out, but he's essentially nonverbal in Spanish (he does have good receptive language, though.)