I'd suggest keeping it in USD or other hard currency. Bitcoin provides no advantages in obtaining/transacting hard currency relative to other currencies, nor any stability while holding it. Either way you are going to a black market, and you are paying real, unaffordable conversion rates compared to transacting in (worthless) hyperinflationary currency.
The bitcoin guy is not going to accept 1 Zimbabwe dollar to 1 USD any more than your black market dealer who has USD. The real currency conversion rate is the problem, not the act of obtaining actual hard currency.
yes, there are a lot of fungible ways to transfer hard currency over the internet... once you acquire it.
again: acquiring it is the hard part, because nobody wants to trade a zimbabwe dollar for a USD.
Bitcoin does nothing to help your zimbabwe dollars be less worthless than they are in USD, therefore they don't help the currency conversion process at all.
The bitcoin guy is not going to accept 1 Zimbabwe dollar to 1 USD any more than your black market dealer who has USD. The real currency conversion rate is the problem, not the act of obtaining actual hard currency.