If I were queen of the world, I'd have the education system simply deliver the Oak system en masse to everyone, so that individual teachers could spend their time on going through pupils' work to see how what they are managing/not managing to do, and giving a 40-minute Zoom/phone session to each pupil once a week to go through any weak points that were evident in their last week's work, followed up by some extra work that the teacher would choose which would practice those areas.
Ie, Emily works on her Oak work each week, delivered from a central platform. Her teacher looks through her work, notices things like "she's grasped how to do long multiplication but is making errors due to not being solid with her tables." During her one-a-week 40-minute Zoom session, the teacher takes her through her tables once again (among other things), and sends her some times-table practice worksheets for Emily to do in addition to her Oak stuff. The teacher's work would be that of looking through Emily's work, working out what needs focusing on, doing the Zoom session with her 1x/week, and pulling out the best additional-practice materials and sending them to her.
Zoom can be set to "Share screen" with only the student's work appearing on the screen throughout the session----that way, no video footage of the teacher or student is being shared. That said, the security issues of Zoom still need some work. Phone calls could be substituted for Zoom if necessary or desired.
Well, that would be my preferred system, anyway!