" This is (IMO) the most important point about digital currency - the promise of providing consumers in unstable economies the chance to convert to a more stable currency without government intrusion. "

This was never the promise of blockchains or decentralized currencies because those things cannot fulfill the promise.

There's a much more pragmatic answer and that's to use Euros, USDs, Pounds or RMBs for a decade or so until the government has legitimacy.

'Cash' is useful in these economies.

Also, it's possible to provide digitized banking for the purposes of transferring money without the notion of introducing new, funny currencies.