According to “Gaeilge Theilinn”, page 126 § 357, the last syllable of 2nd conj. verbs that form their verbal nouns with -ó(dh), e.g. éalódh, iompódh, fastódh etc., is pronounced /É™i/, (spelt by the author -oigh: éaloigh, fastoigh etc.).
How widespread is this in Ulster Irish?
(The author mentions that schoolchildren tend to no longer distinguish them from other 2nd conj. verbs, pronouncing the termination /i:/, so perhaps the question should be how widespread was it?)