Step 1. Impose exchange control (argue about the legality or otherwise) overnight.
Step 2. Require total transparency of assets and income - worldwide - for all living in Greece over 21 days a year and all corporations with incorporated in or doing business in (as distinct from with - a well known point of tax law). Failure to comply - instant confiscation of ALL known assets of the people or the corporations or the management of the corporations (that includes nominees in lawyers' offices).
Step 3. Confiscate stuff from all with over a threshold level - it might be relevant national median (not mean). The degree of haircut can be on a sliding scale - in these days of computers there is no need for a stepped scale.
Step 4. Use that to pay off the IMF and EU.
Step 5. Divide any surplus fairly (lots of room to manoeuvre in that) amongst the poorest N percent of individuals domiciled or ordinarily resident in the country.