How easy would it be it the future to get a different vaccine course if the one you ended up with was not sterilizing? I assume you would have to pay with your

How easy would it be it the future to get a different vaccine course if the one you ended up with was not sterilizing? I assume you would have to pay with your own money, but would you also have to go to a different country and "forget" your immunization record somewhere after you arrive?