Hopefully, some discussions and a general plan will have been prepared.

As Migeru pointed elsewhere, if such a plan was prepared in advance, it would raise a lot of political opposition, unless it is kept secret, which would be impossible.

And I can say I seriously doubt Yanis Varoufakis would support a SEURO union.

"Dieu se rit des hommes qui se plaignent des conséquences alors qu'ils en chérissent les causes" Jacques-Bénigne Bossuet