I see the Republic of Ireland has dire predictions about a No Deal Brexit, rich since their backstop demand seems to have been a main cause of it.

Perhaps the Taoiseach Leo Varadkar should have thought a few things through before gobbing off.
This was the man that threatened to close irish airspaceto to the UK, despite being dependant upon Britain to patrol that airspace if required. A Learjet is the only jet aircraft on the defense force payroll and I do not think "Fighter" is a configuration offered.

From the Irish Government website: “Brexit is posing very complex challenges for Irish aviation and Ireland is uniquely affected compared to other EU Member States given our geographical location.

That same argument applies to all imports and exports from the emerald Isle by all other means.