Maybe you've already thought of this, and if you have, kindly ignore me, but have you posted about this on Twitter or any other social media? There are a lot of hashtags out there to help promote stuff like this. You could post this in an autistic reddit thread; not sure which one, I'm a reddit noob, but there's bound to be one geared toward artists/writers who are also autistic.
There are some orgs you could approach too, maybe? For example, I'm asexual and the Asexual Visibility and Education Network has a website, forums, and twitter account. On their forums, there's even a thread purely about Visibility and Education Projects, and has stuff similar to this posted there. I imagine there's website/orgs like that for people with autism, too.
Best of luck! ^_^