School is where we show people that society will sacrifice them for others without consideration. So it would be on brand and efficient to let it be up to the parents convenience. And now that it's said that large swathes of employment will be displaced by language models, surely there will be enough manpower going around to have two or three shifts of teachers?

Exactly like that. Open office hours from the current start of school (Ts) -2h with supervision, self study, project work. Then regular classes from Ts +2h until the current end of school (Te) -2h, with the same offering of study time until T2 +2h. Total time in school can be reduced by 2h or increased by 2h compared to today, based on grades. Of course it will cost money. But don't get me started on the cost of having many children not fulfilling their academic potential because they are tired due to biological incompatibility with the Prussian ideal of the morning person. And now let's speak about childhood depression... or about the fact that 60% of ADHD diagnoses amongst teens vanish once their sleep is fixed.