You should approach your boss about shift working if you can't work from home.Our IT advised last week that new laptops are impossible to source even for a Government Department! Locked down in the Far East!
Split your workforce into 2 groups.
Week 1
Group 1 self isolate at home Sat-Sun (9 days)
Group 2 work from office Mon-Fri
Week 2
Group 2 self-isolate at home Sat-Sun (9 days)
Group 1 work from office Mon-Fri
And so on...The self isolation periods should protect the groups and reduce the spread of the virus whilst maintaining office staffing