I'll admit I know very little about this (never stopped you before sez you ..) but was joining the Euro of itself the issue or was it bad lending? I know we couldnt mess with interest rates to regulate the economy, but didnt it unlock long term low interest rates which benefited us greatly until we bet the lot on property. So if not in the Euro we could have jacked up interest rates, but in the Euro we could have extricated our heads from where there shouldn't have been and stopped the mania.
I think you know a lot more about it than most commentators.
The idea has taken hold that the Euro was a mistake. This is nonsense.
It has been a huge success for the stronger eurozone countries and it offered opportunity to escape from the inflation/devaluation cycle for the weaker countries. That Greece failed so spectacularly to grasp that opportunity is not the fault of the euro.
If Ireland had not joined the Euro, we might have escaped the worldwide credit crisis. Yes the independent Irish central bank would have uniquely avoided the mistakes made by everyone else. It would have been prudent and strong enough to avoid the madness. If we hadn't joined the euro the FF government would have pursued a sensible mildly expansionary policy and avoided over reliance on construction.