I knew I would get some use from Copilot one day

That is was the robot is telling, which is what I read on the IIA site. Of course, this is an AI, so better double check everything they say!!
"Yes, you can hold an RC model liability policy from another EU country and fly in Ireland, as long as the policy covers operations in Ireland and your flying stays within Irish/EU rules. For hobby models under 20 kg, Ireland doesn’t legally require insurance—but the IAA recommends it, and clubs often insist on MACI membership/insurance to use their sites."
1) Insurance: what’s legally required in Ireland?
Hobby models (<20 kg MTOM): Under EU rules, model aircraft under 20 kg used for recreation are not subject to the EU’s mandatory aircraft operator insurance regulation (EC 785/2004). In Ireland this means liability insurance is not legally compulsory for typical RC hobby flying under 20 kg, though it is recommended. [Regulation...- EUR-Lex]
IAA guidance: The Irish Aviation Authority recommends third‑party liability insurance even for lighter recreational drones/models. If you operate outside “recreational” use or beyond the Open category, insurance becomes expected/required. [Do I need...? - iaa.ie], [Safety & R...ions - IAA]
Heavier or non‑recreational operations: If you operate ≥20 kg or in Specific/Certified categories (or commercially with requirements set in your authorisation/operational declaration), insurance is required under EU/IAA frameworks. [Regulation...- EUR-Lex], [Safety & R...ions - IAA]
Bottom line: For recreational RC models under 20 kg, Ireland doesn’t mandate insurance by law, but the IAA recommends it—and many clubs demand it as a condition of flying on their sites. [Do I need...? - iaa.ie], [Safety & R...ions - IAA]
Anyway, slightly off topic here, but kind of food for thought, interesting nonetheless

but get insured!!