Nationalism aside, do you have any other reasons for wanting a regional currency rather than a borderless, non-descriminate, inflationless (nearly) single currency?
I do not want a national currency, but I cannot think of a way to create a block chain in which there is an authority that can enforce an even distribution of the initial set of coins without a government to enforce it. If you can think of a way to have a block chain that intrinsically distributes the coins over everyone in the world (so that everyone starts out even, you can make your fortune with your skill and luck after that), without requiring a government to enforce the distribution, by all means, please tell me, I would adopt that proposal over my own.