The odds of finding such a specific role with a company in game development in Ireland are quite slim [to nearly none at all]
A lot of it depends on where you are planning on moving to in Ireland, but even then there are very few games companies in Ireland at all.
Dublin or Derry seem to be the areas which would be relevant to you…
You should look at the Companies section of the site and see whose out there and in the same area of game development as yourself and send in a copy of your portfolio and CV. You never know, they may actually need a level designer in the future.