I can suggest two possible methods of maintaining a maximum of education opportunities, whilst enabling maximum safety.
The first is a quick look back to WWII, whole schools were evacuated to the country. A Rota for school attendance was put into place. The local children had their schooling in the morning, the evacuees in the afternoons.
Perhaps something similar could be put into place?
Or looking back into history though more modern. In my last year at primary school, for around 5 -6 months schools, had to close due to general strikes. I had to go in twice a week on a Rota basis to collect work, and give in my last bundle of work. I still managed to pass my 11+ & we didn't have the internet, and.....the libraries were closed as they are now.
Surely we could use those and other things from history could be used to inform us in getting schools safely back.
Finally, there are an army of grandparents and parents too, who could be used to support teaching staff. Use us!