Daft idea's.

[Mike Watterson]

Munster, Ulster (3 of 9 NOT in N.I.) and "SF Irish" are three quite different dialects. Also how English is spoken in Ireland, in grammar and idiom, not just pronunciation varies dramatically by region. Dublin / The Pale has three variations and sometimes called Western Britain.
N.I. divides by East & West of the Bann rather than simply Loyalist / Nationalist and is in some ways Elizabethan. The first one.