Some repatriation flights last year were run with the Business Class cabin sealed off from the rest of the aircraft and a complete double crew carried.
On the way out, the return crew occupied / relaxed in / slept in the lie-flat business seats while the outward crew worked as usual, on the way back, vice versa.
Now we know more about aerosol transmission and how transmissible Dela is, I'm not so sure if that would be allowed.
I'd guess that at the least the Business cabin would need to be further subdivided to keep the two sets of cabin crew isolated from each other