It isn't going to happen at all.
By now they are receiving the expected backlash. Recalculations are being made. Reality is doing what reality does.
By the time the regime could implement anything the wave will have passed and the issue will be moot. They aren't going to do jack.
The UK indicated today that there will be no vaccine passports and they will be ending their lockdowns.
That leaves just New Zealand, Australia and the United States that persist in being tyrannical assholes.
Sigh...
"Scotland and Wales have vaccinated 91% of those aged 16 and over with at least one dose, while England has reached 89% and Northern Ireland 86%. Second doses are also being rolled out, with all nations reaching about 80% of over-16s so far." 3 days ago, BBC News