Ughh, just found out Hong Kong doesn't have a double taxation agreement with Croatia..
So the entire plan makes no sense
Maybe you were asking the wrong question? The first question should be why you were thinking about HK to register a company. HK used to be good, but it has become a very expensive place to do business. Start-ups shall look elsewhere...
Regarding Transferwise, note that it isn't worldwide. I tried to use it, but it could send money to the country where I'm banking.