EU (and US and Asian countries) should just begin purchasing Greece (and other PIGS) notes/bonds at discounted prices -- then purchase new issues as required by the respective governments (at market interest rates -- rather than subsidized ones).
This is largely what the US Fed has been doing -- and has made money in the process.
In Europe -- this would certainly help the PIGS countries, the Euro, and the global community that provides liquidity for the PIGS countries.
Seems like a pretty simple solution to me. Would doubt that they need $600 billion -- if they went this route.