You are free to raise that with the organizer. I am just enthusiast participant in the tournament. I guess they are traditionalists or have other reasons.
All these questions are to be directed at organiser - which I am not I would assume you can put your nick in payer message. Revolut is great for IBAN payments with lower fees than most banks.
Irrelevant to the thread, but question: In Greek “Re!” is an insulting/friendly exclamation/ way of addressing someone (mostly insulting, but if very close to someone is also OK). AFAIK, it’s based on Latin res, meaning thing, so we are calling someone a thing, basically. Is your REE related to this? I’m interested.
Examples:
What did you say to me, re? (angry way to reply to someone who said your tenuki was wrong)
Re you, tell me what you think. (asking a BFF for advice about tenuking)