I guess you could start by opening a co-working space with a supervising adult (not teacher, this adult will be there to ensure that the kids aren't killing each other).
There would be teachers accessible via video calls but most of the time would be spent reading or doing work, not passively listening/watching. If you pool these teachers together, you will be able to teach even the most obscure subjects.
In this system, everyone is literally going at their pace.
I think that fundamentally the main objection to this system is that some people learn better in a classroom setting, to which I reply: 21st century education needs to make a transition to turn graduates into self-learners. This can only be achieved with a system that fosters self-learning from very early on.
It's not like you can create self-learners by making students go through a process that's fundamentally as anti-self-learning as possible.
This will also make switching schools extremely painless. You will transition to a new desk. It's like a gym membership, you can totally have two if that's convenient for you for whatever reason.