God you've had a rough time on this thread. I cant believe the things people have said to you! Im a lone parent to 2 SEN kids and fuck me is it hard.
With regards to adverts. Its an interruption, that come at random. We have the ability to say "oh its an advert" but with an ASD child, their like "wtf its changed, i dont want this". Especially if theres a PDA profile. Its like listening to classical music, feeling settled and calm, and suddenly some blaring rock music comes on, it makes you jump, you dislike it and you want your classical music, and your calm feeling back.
Your solution or "solution" sounds perfectly reasonable. And if a neighbour asked me to do something that would help a little boy I absolutely would. My neighbour has an autistic little girl so we understand.
I had a thought, if after iPad time its the background noise not being there, could an audio book either with or without headphones work? My son really likes Mrs. Honeybees stories on Spotify.
You're doing a great job, you seem loving and caring. Its bloody hard when you constantly judge and blame yourself for things and then others who have no clue seem to "validate" your self belief of "im rubbish"
Just keep doing you, youre doing great