It's a very common practice for economies to peg their sovereign currency to a trading partner; there are on the order of 66 countries pegged to the US Dollar, and 20-odd pegged to the euro.
If a country wanted to move off of the euro, it would be pretty easy to create a sovereign currency pegged to the euro 1:1 by the countries central bank. Then in the future they could simply unpeg (or change the rate) if that became advantageous.
If a country wanted to move off of the euro, it would be pretty easy to create a sovereign currency pegged to the euro 1:1 by the countries central bank. Then in the future they could simply unpeg (or change the rate) if that became advantageous.