The threshold for EOTAS/EOTIS is that it is inappropriate for provision to be made in a school or college.
For DS1, there isn’t a school who could come close to being able to meet his needs. My search extended to the whole of England. School or college is never going to be suitable.
For DS3, an imaginary school may well be able to meet his needs. He would be fine in an imaginary school - a school with no other pupils, taught only certain subjects to a high academic level in certain ways with lots of sensory input, lots of exercise/sport, multiple therapies, sensory friendly building… you get the idea. It is an imaginary school he drew/annotated for the EP, but it is never going to be real, so the imaginary school doesn’t mean it isn’t inappropriate for provision to be made in a school for him.
EOTAS/EOTIS packages are bespoke to an individual’s needs. Packages can include things like tutoring, therapies, sport, cookery lessons, music lessons, mentoring, APs, equipment, professional time and so much more. I can post an overview of DS1&3’s packages if you would like?