Completely agree on the Simply Piano plus MIDI approach. My autistic son is musically inclined, can play piano by ear. We have struggled trying to get him formally trained to read music. Then we found Simply Piano. He's taken to it very well, treating it as a game. This is the only way we have managed to get him to read music. We use it in conjunction with a music teacher via Zoom. Here's a video of him playing https://youtu.be/NEa9X36e7Vo