They could just exchange the crypto coins for their local currency at a fixed rate, and say that the local fiat currency will no longer be accepted after "x" date. This is how the Euro was distributed.
AFAIK Ecuador does not have local currency, they uses bucks. why not support bitcoin, rather than inventing yet another bicycle?..
russian cetral bank is in process of creating electronic payment processor as alternative for visa/mc now and my guess is all these activities are on political grounds as well as BRICS bank.
it may be also the preparation of backup plan for overheated dollar.