On a slightly different subject, if all adults will be vaccinated by the end of July there can surely be no earthly reason for not resuming business as usual from Setember?
Life has to return to normal this Autumn. Students/staff coming in from abroad need to be offered the vaccine.
For those who refuse the vaccine, that's the risk they take and they can't expect everyone else to continue making sacrifices for them.
For those who can't have the vaccine due to genuine medical reasons, then they may need to accept that normal "uni life" isn't for them. There may be limited options for staff to be redeployed to non contact roles, but otherwise it may have to be end of employment based on ill health (like other health conditions could cause). For students with medical conditions, then perhaps the Open University is a more suitable route for their degree.
Once vaccinations have been offered to all adults, it's time for people to "piss or get off the pot". Back to normal for those who have the vaccine or willing to take the risk of "normal life". For the refusers or those with medical reasons, then a change of role/position is probably the answer for them.