My understanding is if you enter via a ferry you apply for an IDP upon arrival.
Normally this was Sth Korea to Fukuoka ferry. But I heard that a vehicle ferry is not running between them as the two countries have thrown their toys out of the cot. Someone may be able to clarify this.
Carnet if you ship it into the country.
You can travel very cheaply by staying at Roadside Stations, like the big servo complexes we have in Oz, but generally no petrol just lots of awesome places to eat etc.
https://www.japan.travel/en/guide/michi-no-eki/
I am heading over in a week for five weeks in Tokyo, if you need me to drop by anywhere to get more info ask away.
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