I know Patrick, born about 1831 and his Irish Constabulary Records were from 1853 to 1860 in Wicklow Ireland.¹ Enlisted in the Royal Irish Constabulary. Age listed as 19. and occupation as labourer.
Well, that puts the cat amongst the pigeons on several fronts.
First, if he was from Wicklow he could not have served in that county. So if you are stating that he was stationed in Wicklow, then he could not have been born there. Which is consistent with him being from the Kildare portion of Ballymore Eustace.
More importantly, though, is you say he was a laborer. That is completely inconsistent with the Dardenstown Keoghs. It is also inconsistent with Australian records (posted by OP in other threads), where it was stated that Darby Keogh was a farmer. It was on that basis that I put effort into looking through the tythe and Griffith's valuations for farms. But if the eldest son, Patrick, was a laborer, then I can't see how Darby was a farmer. Could well be a case of "undocumented social promotion", which did happen - i.e. claiming a higher status than they actually had. And if Darby was in reality a laborer, then he would not appear in the tythe valuations, and might not be in Griffith's (of course he could also have been dead by the time of Griffith's).
If Darby was a laborer, it could also explain a minor mystery: why several of his children don't seem to appear in the Ballymore Eustace parish records. Laborers could move from farm to farm for work, so some years he might not have been in the parish.