Thinking of it, Argentina might be in the wrong direction as they are investing in Bitcoin not creating one of their own cryptocurrency unlike Venezuela where I think they are already planning a second kind of cryptocurrency after Petro and this time it is related to their central bank. Their strategy is of course better than what the Venezuelan Government is doing but in terms of risk I don't think this is a worthy trade off as they really are risking their own money into a volatile market, there is really no guaranteed safe-haven for their money.
Of course there's no guaranteed safe haven. That's why central banks hold various assets as hedges, and also why the rumor is about investing 1% of their reserves into BTC, nothing more.
I still haven't seen a reliable source for this, though. Just some articles about how the central bank wanted more information about BTC and some un-sourced rumors about these supposed plans. I'd take it with a grain of salt.