that is most convenient for the teachers
Nope, also extremely inconvenient to them. It's only actually convenient for a small selection of neurotypicals with ideal or near ideal home lives/parent involvement, while nearly every other kid benefits from basic adhd accomodations like fidget toys or being allowed to sit/lie wherever to do their work. We haven't made any significant progress on teaching since the victorian era.
Using an item you haven't identified is always a recipe for disaster. I have not once heard of a group using an unidentified item and finding out it was anything other than the worst possible thing to use in the situation.