Hi Martin,
Welcome to the club. Registration in Ireland would depend on a few different things. Does the kit use the original mr2 chassis or a new one? Also, what year was the mr2 donor? Has it ever done an IVA test?
For insurance in Ireland, Barrets are the option used by almost everyone that I know of in the club. They insured my Westfield on the UK plate while I transferred it onto the Irish one.