Bonjour Alexis,
I'm sorry you didn't get a reply earlier, and it's great that you want to capture drone footages during your next visit.
According to the
Citizens' Information website, you need to register your drone in France in case it's heavier than 250 grams (if you have a DJI Mavic Mini or similar, that wouldn't be an issue). Once done, you won't have problems flying it in Ireland and getting through customs, given that you respect the flight zones and safety precautions detailed on the
IAA websiteWhat are some of the landscapes you'd like to capture from bird's eye view? Watch out for the wind, I managed to get Howth Head footages but it was a bit tense (I'm flying a Mavic Air).
A bientôt,
Antoine