Ok, I bit the bullet and tried to order. I used a VPN to connect to a japanese server, just in case.
You have to create an account to order. They ask you for a japanese address and you can only input kanji as your name. I entered all the infos of a forwarding inbox I have in Japan (tenso.com) and managed to create an account on Ricoh's japanese website. You're offered to pay in either 3 different ways: paypay (not a typo), credit card or coupon codes.
You need a japanese phone number to use paypay, so I tried to buy using my credit card.
Of course, the payment system triggered an error (obviously because the name and address on my credit card didn't match their infos).
tl;dr: no, you can't buy the GND feature without either a japanese phone number/paypay account or a credit card issued in japan, for now.
Last edited by hundredf; 11-12-2022 at 08:11 AM.