In this case a possible solution for greek people could be a Bitcoin debit card to pay with or to try to withdraw cash with. If this works, the only question would be how to fund the bitcoin wallet the bitcoin card is attached to. But I don't know if restrictions are over or not.
The bitcoin debit/credit card can be a solution only for those who are profits or salary or any other kind of revenue in bitcoin. If not, what to do with such card? How or where to find the bitcoin to spend if you have not source from where you can have those? You can use your money to have bitcoin to charge the card with those but why this way to use your money? You can use these directly.
Then the use of bitcoin in such way is not a good move according to me. Spend big amounts of bitcoin in this situation is loss. I hope (I think are to many and not me only) that the price of bitcoin go high - at least with the halving. So it will be a big loss to spend to many bitcoins now (this could be the amount needed to make normal life) when after 8-9 months these can have bigger value.