The folk musician Ross Daly is of Irish descent, and has lived in Crete for 35 years:
He has a broad Cretan accent, and he has something non-Greek underneath it. But it’s subtle, and it’s not an Irish accent per se. At most, it’s a somewhat overcareful enunciation, and maybe, if you listen closely, some aspiration on his voiceless stops. (Which is English, of course.)