I'd like to see something like Australia's no-jab, no-pay policy. If you don't get your kids vaccinated, you don't get any of the government financial support you'd otherwise get. I'd expand this to tax credits for having dependents as well. It might not convince the most militant anti-vaxxer, but it can probably ensure those on the fence, or those who don't feel like keeping up with the schedule to keep up with their vaccinations and improve the herd.
https://www.theglobeandmail.com/opin...-unvaccinated/