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Not entirely sure, but I think it only exists as a revolter. So you could start a game as England in the 1520 scenario and wait till you can release them, then switch to playing as Eire.
 
I have an event in my personal mod if you wish to form Eire as any of the Irish minors.

Just make sure the ID is free and that you write some text for the event. I think it should work.

Code:
#########################################################################
# Crown of Ireland
#########################################################################
event = { 

	id = 1001
	trigger = {
		atwar = no
		isvassal = no
		owned = { province = 231 data = -1 } # Connaught
		owned = { province = 232 data = -1 } # Ulster
		owned = { province = 233 data = -1 } # Meath
		owned = { province = 234 data = -1 } # Leinster
		owned = { province = 235 data = -1 } # Munster
		OR = {
			country = CON # Connacht
			country = LEI # Leinster
			country = MEA # Meath
			country = MST # Desmond
			country = ULS # Ulster
		}
		NOT = {
			exists = EIR # Ireland
		}
	}

	name = "EVENTNAME1001"
	desc = "EVENTHIST1001"
        style = "1001"

	date = { day = 18 month = july year = 1389 }
	offset = 150
	deathdate = { day = 14 month = july year = 1789 }

	action_a = {
			name = "ACTIONNAME1001A"
			command = { type = country which = EIR }
			command = { type = stability value = 3 }
			command = { type = vp value = 100 }
		}

	action_b = {
			name = "ACTIONNAME1001B"
			command = { type = domestic which = aristocracy value = 1 }
			command = { type = domestic which = centralization value = -1 }
			command = { type = stability value = -1 }
		}

	}