I'm not able to help with your question about birth registrations. However, some of my ancestral families come from Kilkeel as well and I have a Robert McKee father, son and grandson combination and wonder if there might possibly be a connection. I have Robert McKee (father), 1803 - 1836 married to Eleanor Austin. Robert McKee (son), 1836 - 1910 married to Margaret Galbraith. And, Robert J. McKee (grandson), 1871 - 1940, married to Lillian Scott. This family originated in Kilkeel and relocated to New Brunswick, Canada.