Adding all the kids to a new household shouldn't take more than a minute with MC's "Add Sim" feature.
Then again, all that moving is unnecessary, as long as you have NRaas Traveler in place, which is recommended to prevent any oddities from happening during all kinds of different travel, including university. Just set Traveler to allow "friends" to be included during travel, and you can just choose all those sims to go together to university (as long as they are at least friends of the sim who starts the enrollment process), even if they live in different households. They will go back to their original household after you return from university.
Just make sure everyone who goes took the test within 48 hours if you want them to have starting credits and/or stipends.
For valid housing, SP will check for beds and fridges, but only after midnight. Time at your homeworld doesn't proceed while you are at university, unless you activate SP there. But even in the latter case, you can then disable aging for your homeworld in the Traveler settings while at university.
