Talk to a flying school anywhere in the world that has reasonably reliable weather book continuous lessons for about 4 weeks - about 2 per day, knuckle down and do all the written exams before you go there - stay VERY nearby, make sure there's absolutely nothing else in your diary for those four weeks.
Parts of the USA have particularly consistent weather, and schools geared up to exploit that. At the same time, you'll then need to learn how to fly in Ireland with its own weather, terrain, air traffic services and local regulations - so I'd say, do it in Ireland - but if you have a lot of commitments - go to the other end of the country, stay in a B&B, do it about August when the weather's most likely to be good and tell everybody you're not contactable.
G