We really don’t know how well he does in school. Since he has academic interests, it would seem he might do well despite challenges. Without a little more information I would not feel comfortable making recommendations, though you already have a great list. And Colleges that Change Lives is a good resource.
Did he have accommodations on the ACT?
If he is a bright motivated kid who does well in school, here is a list of test-optional or test- flexible schools, many of which are excellent.
Landmark, Curry and New England College are good recourses for a kid with learning disabilities, but many kids with ADHD can function well at several schools if their high school experience was good.
Accommodations only go so far, and are offered at a lower level at college than duding high school. You might want to make a list yourself after doing research, and then have an MD or neuropsych. sign. Single room, note-taking, extensions on papers, exam by himself, are examples.
The Disabilities Office will give him letters for all his professors which may or may not state the accommodations specifically requested, and most likely won’t mention the actual disability (though the prof.'s can access the file).
It is up to the student to discuss accommodations with the professor.
Often deans, advisors, doctors, counselors and others are more helpful than the disabilities office. He will need to figure out the system.
Some parents, who can afford it, hire a coach who can help with time management and other tasks, in person, by phone or online.
I am not sure about the kind and understanding student body! There will be kind and understanding individuals at many schools but it takes time to find them.
It does sound like your son has authentic academic interests and a priority might be a campus that is engaging intellectually. Again, I think you have a great list already.