Reliable teaching would be straightforward, but not cheap to set up. You wouldn't want the models used to have the entire sum of the internet trained. Just verified clean data.

You could start with textbooks, peer-reviewed studies, IC data from teachers, then add 20% reviewed, distilled content from a fully trained LLM. Set the whole thing up on rails. Curriculum, pacing, and testing would all be classical programming, architected by people, using a more widely trained LLM to sort out language and edge cases. New edge cases get human review. Set up a quorum of models that get hit on every request to sus-out errors. Backend is the source of truth, front end is not allowed to countermand the backend, and that's tracked by another quorum.

I think the biggest problem isn't doing it, the biggest problem is not destroying society to get it done and not allowing society to take it over with an agenda. We can't have the teachers disappear. It's ripe for corpo/government manipulation. For something like this to work, you can't have capitalism driving profits. You can't have cults indoctrinating. It would all need to be very post Bell Riots Star Trek, and we KNOW that'll never happen.