Greece could end up better off divorced from the EU if they play it along the time honoured lines employed in manipulative relationships through the ages. So here is one suggested path they could take.
As with all negotiations there is a need for the other party to know that they are not the only one in the game and it looks as though the carrot/stick of Russian patronage is already being flagged by Greece. In a relationship this is the "Well don't worry darling, I don’t need you anyway, there are plenty of fish in the sea" stage.
This threat of competition is used to negotiate the best possible deal with the EU, in return Greece promises the world, new love and commitment - the ‘Of course I love you darling, wouldn’t do it if I didn’t love you‘ stage. We do have to worry that the EU has heard all this before, but let's press on assuming that they are kind and trusting.
Part of this negotiation would be for more cash up front in return for those strengthened future commitments, as per current suggestions of zero coupon bonds issued at 50% of face. This is the ‘Can I borrow £100, I want to get you something special but haven’t got quite enough to pay for it’ stage.
Next, spend the up front cash importing the best German/EU infrastructure and capital goods possible. This will please the Germans no end and encourage them to extend further credit from the private sector which you take full advantage of and leverage up on that capital goods importation. The ‘Of course you can trust me, isn't it going well, let’s open a joint bank account together’ stage.
Then build like crazy on ports, roads, tech infrastructure to the point that all the budgetary measures that the EU were inflicting on you blow out. The ‘Where has all the money gone from the joint account, darling?’ stage.
THEN Greece defaults on all EU debt and walks away. The ‘I’m leaving you. You never understood me and were far too controlling, surely you saw it coming’ stage.
Then Greece walks into a new relationship with the bit on the side they had been cosseting all the way through and she may have a Russian accent. The ‘I cant believe he’s left me for some Russian tart who’s only got her own interests at heart. And after everything I did for him!’ stage.
Once divorced from the EU, Greece can be reshaped along the lines of Singapore. Tsipras is standing under a socialist flag and can substantiate within that social control similar of Singapore. Greece already has twin surpluses and free from the shackles of EU debt, EU regulation and EU politics it could quite possibly become a magnet for investment, free enterprise and trade that is finding European practices more and more restrictive. The same goes for financial services and institutions under the social cosh and restrictive regulations who may well find the proposition of moving to the new Greece attractive. Even providing old fashioned Swiss style (very) private banking to the world's grey money may be worth the compromise of being shut off from European funding through regulation and anti-money laundering requirements. But where there’s a margin there’s a way. At the very least they’ll be able to import Chinese solar panels without that ridiculous EU tariff being applied. Handy for a country with that much sun.
Other EU countries with similar EU constraints may watch on with envy and could themselves be drawn into doing the same and joining a Nouveau-Euro zone. The risk that the core EU have is that debtors default en-masse leaving them holding all that defaulted paper. Once this is perceived to be happening there would be a stampede to the door, with the debt getting compressed onto the remaining members of old-EU. Much as with banks, a good eurozone and bad eurozone would evolve. Only in this case it wouldn’t be voluntary. All the debt would be end up compressing into a smaller space, much like a blackhole, only in this case the singularity may have to be a sacrificial holder. How about Luxembourg?
With previous debt load wiped out and proven backing (financial and military) from new sources, the credit function of Greece would suddenly look rather attractive. The risk of course is that they could play the same game again and walk away, but as is seen with company restructurings memories are pretty short when it comes to new opportunities.
In summary, there are many different courses that Greece can take but if we are thinking of them snubbing Europe and going it alone then there are opportunities to set up a hugely competitive free-trade state right on restrictive Europe’s doorstep.