lol.. Not really. It would be no different then them buying US dollars, exiting the Eurozone, creating a crap currency, then converting back into their crap currency. It needs nothing hard at all. Any paper or fiat currency will work.
Greece will not have to export anything, all they will have to do is find someone willing to sell. That's where a bit coin operation would work. They purchase bitcoins from whoever sells, when they exchange them back out, it's the current exchange rates. Whoever sells them can purchase hard assets or take the loss or do whatever their scheme allows.
Greece could purchase gold and do the same. Using a crypto currency only allows that to happen without having to purchase the asset themselves.