Dún Laoghaire

/du:n Le:jr'@/ or /du:n Li:jr'@/

Woudl you do this: /du:n @ Le:jr'@/ as there must be time to shift from /n/ to /L/?

Does this occur in other such scenario of lentis-fortis and vice versa?

As an aside point, I feel the first vowel in /Laoghaire to be not quite /e:/ but a slightly different quality because of /j/.

Hi!
Don't think there can be an epithentic vowel. Consonant groups like that are not usually separated, there's no use. I mean I'd say [du:NLi:r'@], as n in dún is mostly pronounced broad in Conamara (except for Carna, e.g.). As for lenis-fortis or vice versa, I think assimilation will take place (most probably, fortis-fortis, as there are no examples of lenis-lenis clusters in Irish). If I'm not mistaken, gh followed by long vowels is simply omitted. Everywere.
Peter

Peter,
anticipation /asimilation: I expect it may occur, and I think it is a very prevasive feature of Irish, so I would go for /N/ due to influecne of /L/ but for the sort of input of Lughaidh flying the banner of Gaeilge Dun na nGall!

As for /j/ I think it may be articualted in Donegal, but it would not be the phonetic /j/ more of an allophone, methinks.

I was a' driving there the other day and passed a village caled Fionach in the new orthography, but on the other side of the village, 'Fiodhnach', so you have /f'on(@)x/ vs /f'ijon(@)x/