The problem is that the Irish were never really militant until after the 1916 rebellion.
America backed Irish independence pretty heavily.
Yes, precisely. I really can't think of a way to accurately model the Irish Question without an event chain though, as Ireland's experience was rather unique. You would also need to make it clear that simply giving home rule, or even independence to the whole of Ireland would lead to a big spike in militancy for all British POPs, not just British POPs in provinces that are Irish cores.