Thanks all. My main concern was that I knew Ireland wasn't within the Schengen area but part of the EU. Similarly and inversely with Switzerland and Iceland they're within the Schengen Area but not EU members. In addition to that, I was sure if HEL-DUB would need us pass through Schengen area at HEL. So its good to clear things up. I do think in cases of IRROPS, it would be wise just to get a long term Schengen visa to pop-in and out of airports.