That presents a very interesting question, then: was the British Army aware of the originator of their particular shade of saffron was the leader of the Easter Rebellion?
Probably not! At this point, it wouldn't surprise me to find that the man who suggested it might have been a graduate of St. Enda's.

Also, re. the green harp flag, for those who were not aware, green was not the original colour. It was, in fact, blue. St. Patrick's blue and the harp.