Maybe it was in the pre-HOI/Vic days, I don't remember.
I agree that the ENG AI needs some motivation to take control of Ireland, if you're playing historical, because it never does it. I, too, am tired of the Portugese/Spanish/Swedish/French/Scottish Irelands I have seen. However, if you are playing historical, I don't think that ENG should have a "claim" on all of Ireland in the 1540s (I was unaware that the British crown was ever declared Vortgern. The only one that ever existed, I thought, was Brian Boru. If you could lead me to a source that supports your argument, I could be convinced otherwise, though

). Here is my suggestion, as a compromise, then:
1) I agree that there should be an event in the Elizabethian era that replicates the "settlement" of Ulster and expulsion of the native Catholic nobility. (Add a core to Ulster, religion to protestant, etc.)
1a) Add the core on Dublin (the Pale) with the Vortgern event.
2) Add cores on the rest of Ireland during the reign of Cromwell. Raise revolt risk in Munster and Leinster.
3) Event the lowering of revolt risk after X time and keeping Munster and Galway.
4) Ramp the revolt risk back up circa 1790 if either the American or French revolutions happen, especially in Ulster (show the reaction of the Orange Order with republican ideas).
5) Use (4) as a trigger for the Act of Union event posted above, adding Gaelic as a culture (superfuous if the Scottish Act of Union event fires, as it adds Gaelic already). Lower the revolt risk again, but what, maybe a loss of population in Ulster/Dublin? Stability hit? Loss of any manufacturies (how many of these are there ever in Ireland, though).
If you're interested in this, Jester, post back and I'll draft and post the events.