1. Are you Ok if their children are excluded from school?
2. Are you OK if the unvaccinated are not allowed to work and make a living?
3. Are you OK if the unvaccinated are not allowed to use the supermarket?
Doesn't really matter if I'm Ok with those things. What matters is if Parliament votes to bring those things in, then challenges to the ECtHR will not succeed, because they've already been ruled as proportionate. But since you ask....
1. Already happens in some states of the USA. Can't remember which virus it is - Small Pox, Measels, or summut - but if your kids aren't vaxxed then they can't go to state funded schools.
2. Already applies here (England) if you're a care worker, or frontline NHS. I believe NHS Surgeons also have to be vaxxed for HepB too.
3. Not aware of anywhere that does that, unless you're currently infected and supposed to be in isolation from something.
I get that there are "slippery slope arguments" everywhere in this, and that's one reason I support our current system of Govt. Idiots in the commons who read the Daily Mirror elected by the public who read the Sun and Social Mejia. And a house of Lords containing people of representing the Law, former Politicians who know how it works, and Religeous leaders trying to protect morals. It's not perfect, and yes there are chancers everywhere, but I'm not aware of a better system.
To put it in Star Trek terms - "the needs of the many outweigh the needs of the few".