This is an interesting thread for me because I studied classical singing. I was required to take a diction class where we learned the international phonetic alphabet (IPA) and had to apply that to lyrics to songs in French, Italian, German and Spanish. It was a very exact science.

For our purposes, such exactness isn't really imperitive. I think using an accent is ok, and as it has already been pointed out, it can be done well or badly.

I would suggest finding a recording of your song done by someone Irish so you can listen and emulate them. Go for it, and like Anniglen suggests, ask the audience!

Margarita