This only addresses one axis of your concern, but if they are accessing YouTube via desktop browser (or Firefox on Android!), the "Youtube-shorts block" extension gets rid of the Shorts UI. You can still watch Shorts, it will just display them in the normal video UI without infinite scrolling. It's a huge quality of life boost.
Although obviously this does nothing for those using the mobile or TV apps.
Although obviously this does nothing for those using the mobile or TV apps.