I think you'll find the so-called "Cross of St Patrick" is nothing more than the family flag of the Fitzgerald family, adopted officially following the parliamentary Union of 1801 as a British-approved sign for Ireland; there was some kind of loyal organisation from the 1770s or 1780s which had already used this as part of their insignia. Slap a big Red Hand in the middle of whatever replaces "The Butcher's Apron", to represent the Six Counties, if ye like; but maybe it would be regarded as provocative to impose one pattern on top of a national flag, though of course that visual demonstration of Power may be seen in the current design. For a while.