The major difference between the Greens and the SNP last indyref was over currency, and as you say it was one of the big uncertainties which turned people off voting Yes.
Hopefully the currency issue will be addressed more thoroughly, Common Weal have done brilliant work making a case for a Scottish currency and a Scottish National Investment Bank, and outlining the economic benefits of having more control of the economy.
I think Scotland has to make a choice.
We can stay in the EU (and we would be permitted to either stay or rejoin, many senior EU officials have confirmed this). Purely in terms of economics, Business for Scotland estimated we get back £20 for every £1 spent in the EU in rebate, subsidies, and trade. We can stay part of Erasmus and ESA, and enjoy free movement across the EU, which benefits us as we have a small population which is below replacement rate and immigration is good for us.
Or we can stay in the UK. There may be a hard Brexit costing £66 billion, it is £1.6 trillion in debt which we must service. It will cost us our current trade relationships with the EU and we are currently not even permitted to have the First Minister made aware of what negotiations are being made to replace them.
Indyref was a 55% stay in the UK, EU ref was a stay in the EU by 62% in Scotland. So I think another referendum is justified, as it increasingly looks impossible to have both of these.