Irish pilots in the RAF
I'm an Irish citizen and a British SUBJECT and joined the RAF without any problems -- in 1948. My father was also Irish by birth and served in the Royal Flying Corps and the RAF. Three of my brothers also served in the RAF. In fact a great number of famous RAF pilots were born in Ireland and reached the highest ranks in the RAF. Air Chief Marshal "Paddy" Bandon, The Earl of Bandon, was one of them.
I suggest you contact the RAF and ask them if you qualify for consideration for training as a pilot. As far as I know there is no restriction on nationality, but you may have to become a British SUBJECT and you will have to swear loyalty to the Queen.
Slainte.