You bill from the Netherlands and I think this is the only thing required. Uber in Europe charges your cards from Uber BV for example. And I think Uber is pretty international.
Why would you otherwise voluntarily subject yourself to the extreme complexity of countries like Belgium or Germany if you could just set up a simple Bulgarian or Estonian llc?
If someone has experience doing it right, I'd absolutely be willing to pay for their time to exchange advice.
edit: it's a regulation, not a directive, so it will be directly available in all countries, without each country creating its own laws to implement it. But it'll take until 2028 or so until it's actually be available.