IMO few if any over the counter incubator fits the bill... Not saying that no over the counter will work as their is little question many are in use in schools everywhere, from bottom of the basement foam ones to higher end ones...
Let me explain my reasoning why most commercial ones fail to fit the bill...
Almost all commercial offerings have small if not limited viewing areas, I have two children and they fight over viewing space and bump and push around the incubator, I can't imagine having 10, 20 or 30 kids trying to get a peek...
They almost always have out in open controls that are just begging for kids to play with...
Even the better constructed ones are not really made for the type of abuse children can toss at them...
School incubators (IMO due to weekends and long overnights with no monitoring) need to be almost fully automated and few commercial offerings provide this reliably over several days...
Again on the lack of overnight and weekend access complicates things, little stuff that can be tweaked at home doesn't happen when you can't get to the incubator, especially say during a storm with the loss of power...
*I have heard many teachers bringing the incubator home for the nights and weekends but again very few incubators are designed for this type of handling among other hassles...
With that said and a few other issues, I personally believe a custom built unit is likely the best choice, but then of course you run into finding someone to build it and the cost associated...
I can't even find a decent commercial unit that fits the needs I want at home and thus I'm going to design/build my own from ground up for this reason...
Either way good luck on your quest, may I suggest looking at
Brinsea Octagons, they have the most bells and whistles, but they come with a price...