I'm curious, what would you use device management tools for? They auto-update, so it's not that, and they don't hold much local software (other than Android apps). It seems like a small enough number of devices that it's fast enough to run one-off tasks on each of them manually.
By their nature there really isn't much one-off stuff to be done. We've got the kids on Supervised (local-ish) accounts which lets us monitor their browsing habits and enforce SafeSearch but that's about it.
The glaring hole is that they can't install Apps / Extensions and there's no way for us to do that on their behalf.
