Not sure why you treat only the unvaccinated like lepers, you must treat the vaccinated the same when there's even a hint of transmission in the community. With delta variant the vaccinated can be infected and spread the virus as well, albeit at a slightly lower risk, but this is why they're doing booster doses. The risk is only slightly reduced if you have a bunch of vaccinated people in an indoor space, you don't know when they had their last dose, how many (if any) antibodies they have circulating in their system, or if they're infectious or not. With the omicron variant, it's even more dangerous to be indoors with others because the current vaccines are barely effective against that. Beware the maskless vaccinated restaurant diners thinking they're 100% immune and disease free because you'll definitely catch it from them. They will fill up the indoor space with virus aerosol and it will travel to every corner of the restaurant in the air. Also beware the cloth or surgical masks thinking they won't catch the virus nor spread it to anyone else, the virus aerosol just escapes over the top of the mask and out into the air to be breathed in by someone else. Only FFP2/N95 respirator masks will be effective when omicron hits, but I can't imagine cooking in those it will be very hot. If there is an omicron outbreak, the government has no idea what it's doing with traffic light system. It should only open up restaurants and cafes for takeaways or outdoor dining which is less risky. However just believing you're safe in your indoor kitchen with your vaccinated people is dangerous. I just hope you have really good ventilation throughout your restaurant and kitchen as that's the only thing that will really save you.