Just a remind.
It's possible to purchase games on Itch.io by adding USD to your Paypal account using this method below.
https://www.paypal.com/br/smarthelp/article/como-posso-adicionar-saldo-em-moeda-estrangeira-na-minha-conta-paypal-faq1348
It's far from being the perfect solution, but it still works. =)