Hi Gearoid, welcome to beekeeping. You did the right thing by doing the course and joining your local association.
Yes, you are correct, National and Commercial are the main types of hives used in Ireland, but some people do use Langstroth and most of the bee supply shops sell Langstroth equipment. Unfortunately the people who sell nucs all seem to operate in National equipment as that is where the market is.
I dont know any Langsroth beeks myself but I suggest you ask people in your association if they have any members and approach them directly. They might be pleased to learn of somebody looking for a Langstroth nuc as they wouldnt nornmally have a merket for a nuc.
Failing that have you seen the first post below. This would allow you to house the National nuc in a Langstroth brood box, add proper Langsroth frames with foundation around the central national frames, and replace and rotate them out over the season.
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