Congrats on the purchase! I don't know of any Cork specialists besides Dan Seaman who are main dealers. Grandon's used to do Alfas but are no longer accredited for servicing, although I'm sure they still have any special tools etc.
I recently had my G (1.6 jtdm) in with The Sweep Garage in Kilmeaden, Co Waterford. They did a good job, used to be a large Alfa dealer.
If you know of any specialists in Cork let me know!