I think I'm with the sing it like it is contingent on this one.

Andy Irvine sang and probably recorded Aragon Mill in its original form, and they don't come more Celtic than Andy ;-) I never understood the need to change it to Belfast, although whoever did it probably thought that it would appeal more to Irish audiences if it was 'localised'.

I don't know the song, but it looks interesting. I think you could make it fit in (if you think that's necessary) with the other celtic material by adapting the music rather than the lyrics.