The nearest large town to the area where you will be operating is Londonderry (Derry) in GI-land. Londonderry is about 30 km south-east, or east, of the first three summits you mentioned, so if you have a good take-off in the south-easterly direction it should be possible to work stations in the Londonderry area with a handheld.
The last one on your list (EI/IN-013) is the most remote from any large centre of population, but from there you will have a 40 km sea path to Sligo to the south of your QTH, so that is a possibility. However, nobody has ever made any SOTA QSOs on 2m from this one!
Try calling CQ on 145.500 MHz, then QSY to a clear channel up or down from there in 25 kHz steps. It would be a big help if you can self-spot when you are QRV … perhaps using SMS spotting if you can make it work from EI-land. Or phone a friend and ask them to put up a spot for you.
Good luck, and have a very nice holiday!