Asking any County to give up their currency and allow a decentralised money to be used instead seems like a non starter...
Thailand introduced Bitcoin BTC payments for travellers if they signed up to the government controlled program, I think that was rolled out in Phuket...
I think the Neo Banks like Wise and Revolut will break down barriers where crypto can be held on their platforms and spent as any FIAT via QR code payments converted in the apps from crypto to FIAT.
Crypto cards look like another work around...
Control of the money was always going to be a battle when Governments want control over literally everything and everyone.
You can apparently book a flight with BSV, after that it's often about workarounds