Make the EU kick them out of the Euro...or, not.
Intransigence is the better option -- default and expulsion from the EU would be rougher than what they're doing now, even if they were doing it now. Which they barely are. In a relatively few years they'll be partnered with Azerbaijan, Turkey, Cyprus, and Israel (more than one partnership) piping natural gas and oil into the EU market, and there will be some alleviation.