Cat import process with 3 year rabies vac

Hi! I'm moving to japan next year and will be bringing my 2 cats over eventually.

I got their first rabies vaccination last week, and told the vet they need 2 shots per the Japanese import laws, but the vet says the duration is 3 years and they don't need another. (Nobivac)

I tried to argue that the import rules are clear that pets need 2 vaccinations, 2nd one administered 30+ days after the first, but they disagreed and thinks I should take the blood tither just after the first.

I think i'm going to just send my cats for the 2nd dose once the 30 days are up, but wondering if there's anyone with experience on importing with just one 3 year rabies vaccination?