yes i believe if you exchange to GBP or EUR or USD , is a one way ticket. the banks will not allow you to buy it back in one go, maybe in 900€at a time or most probably nada de nada!! or ... maybe they will allow you to buy the ETF so they can control the keys

if you go to usdc or usdt on your wallet still is like having money in a bank if not even worse.

that is why i recommend if you have to sell buy gold bullions fron the royal mint and keep it with you in your own safe. that is the closest thing to #bitcoin