First things first.
A Finns Party government is a NO vote on any future EU bailouts.
Forcing Greece into default will have the same effect on the EU as any other member departing.
There is no need to directly advance an EU exit strategy when there are other means immediately available.
There aren’t any EU bailouts. There are loans with very draconian terms, to wit that whatever country takes them has surrendered their financial sovereignty in perpetuity to the elites running the EU, never mind political sovereignty. A Finns victory in Helsinki will never stop that from happening so long as the elites want it to keep going on, although with the will, the Finns would extricate themselves from an entity that cannot be reformed from within any more than the USSR could be.
Take a closer look at what the EU did to Greece. They forced the government that initially refused the loans to fall, and be replaced by a government willing to take them in exchange for their terms. It’s economic imperialism and blackmail. The exact same thing happened to Ireland, Spain, Portugal and Italy.