Hi @Fredrick0, you have presented your case very clearly. Seems like your concerns are bank charges, currency conversion fees and the delay in your receiving payment. Many hosts around the world have these problems and, not being an expert in international banking, I have no solutions for that, unfortunately.
But with regards to accepting cash as an alternative, let me play the devil's advocate here. By paying Airbnb up front for reservations, guests are making a commitment. Without that commitment, guests would feel free to cancel or otherwise not show up and you would be left with no compensation at all. In addition, your calendar would have been blocked for that guest with no ability to recoup the lost income.
Also, what would you do if the guest shows up and doesn't have enough money? What if they cause damage and can't pay for it? What if the guest arrives and wants to negotiate a lower price at the last minute? On the flip side of the coin, what protection does a guest have from unscrupulous hosts who at check in want to charge more than the posted price?
Cash transactions have a way of unraveling the reservation process. By holding the reservation money, Airbnb acts as an honest broker to protect the host and the guest ensuring that both play by the rules.
I wish I could solve your banking problems, but cash payments can do more harm than good.
If you want to escalate your concerns to Airbnb, you will need to contact them directly as there are no Airbnb employess on this site, unfortunately.
I hope this has been helpful, Clare