Probably not. If they still claim France (and maybe get it), this CoA is going deprecated. It is the reason why I abolished this arms. It even included arms of Wales that was part of England then. Portugal is independent and not claimed by this union. Anyway, it has no problem with the name "Atlantic Kingdom".
England, Scotland, Ireland, Wales, Portugal and Spain? Very nice. I don't like the bordering of Gules on Gules and Argent on Or in fields I and III though - better exchange IV and III. As for the shape of the shield, perhaps better make it a normal shield with a normal heart-shield? That heart looks like a lady's CoA ... Otherwise nice. I like the ideas of including the Spanish cross like this.
I don't think Ireland would unite with any of these countries, save for Scotland and Wales. Considering it's been in slavery for a thousand years to a royal protectorate, I think they would probably smell something in the air and bow out.
I can however see them confabulating with the Scots and the Welsh as former brothers in bondage. Especially given the shared celtic heritage of the scots and the irish.