I'm okay with governments exerting extreme social and economic pressures on antivaxxers and cutting them off from access to public services and spaces. I'm not okay with violating the sanctity of the individual in order to accomplish the end goal.
Are you also okay with the government no longer taxing them, then? Public services are either public or they're not. It'd be unfair to have means testing for public services that we all need.
I haven't given a lot of thought to the details, to be honest. I don't think they should pay for services which don't benefit them. Services which do confer an indirect benefit, but which a family isn't able to directly participate in, would maybe be discounted. Other services (roads, public utilities) where the family doesn't come into physical contact with others and doesn't put others at risk would continue to be made available and paid for as normal.
The calculation would be complicated and we'd have to hash out different answers for different countries. Ideally, tax codes shouldn't be as complicated as they are, in which case I could give you a much simpler, ideologically pure answer... but we've inherited messy systems which require messy, imperfect answers.
Still, I'll always take the solution that maximizes freedom over the one which doesn't, even if it isn't perfect.
In any case, it's pretty insane to treat unvaccinated people as some kind of leper. They don't need a scarlet letter or to be treated as lepers, dude. Nothing's going to happen just because you walk next to a person who was not vaccinated. I say this as someone who thinks anti-vaxxers are off their rockers.