Norwegian legislation is more in conformity with the rules of the European Union than most member states.
The euro area must not be treated as an 'opt out' from the European Union.
A new state, if it wants to join the European Union, has to apply to become a member of the European Union like any state.
By the way, the European Union Member States together - even the euro area Member States together - are by far the biggest contributors to the IMF.