Have you looked into the Southeast Asian iTunes release? That was the original theatrical version.
For some reason, I was unable to watch it. Is it because it is in Japan? At any rate, I will try various things.
Of course, if the viewing is successful, an IMAX edit will be done on the original version.
Also, we need to make a version that is currently being shown in Japan.Director Shinkai, you should include all of them on Blu-ray. Like Blade Runner!
It is only in Singapore.
You would need to make a Singaporean Apple ID (or even temporarily set your pre-existing Apple ID to Singapore).
Then you can get a Singaporean iTunes gift card here: https://www.seagm.com/itunes-gift-card-singapore
Or here: https://www.play-asia.com/search/iTunes+Singapore
There are also other alternative methods.