Would voice to text work? That's what our kid uses for longer stuff. Google has one but there's Dragon and Otter too. Kennedy Krieger may know; they have OT for everything under the sun and do all sorts of functional assessments and recommend software

Voice to text works great for writing assignments at home, but not for note taking and in-class assignments. We had some BAD experiences with KKI, but are working with another OT right now who is giving me some hope, but moving sloooow.