lol - Well, the plan was that the 2 younger kids get new iPads… then their current iPads go to our oldest son (who has broken 2 to date), and us parents… 4 iPads between 5 people… no spares, sorry.
The school is not forcing the older kids to change to ChromeB’s - just the 3/4 graders. (So the grade 5/6 kids don’t need to change to something new, that then wont be used in high school.)
As such the plan now is - the wife and I will start using 1 of the new iPads ourselves… give the other to the middle kid for Xmas so he can upgrade from his 6th gen… youngest will get a Chromebook for Xmas, and probably pass the 6th gen to him, and the oldest can have the 5th gen which he’ll probably break sooner or later. Don’t feel bad for him though, he’s getting a new laptop that better get him through Yr11, 12, and into Uni.
So - still no spares. 
As for being pushed to Mac by bad experiences on PC… at this point, the games on PC are too alluring… at least for the 15yo.