I see, or rather, hear, what you mean about Calum Kennedy. I think the pronunciation in the other two versions is more common.
   I would suggest using the word "balaich" instead of "gillean" as in the lyrics above, because the first syllable falls on a short note in the tune and the second syllable on a longer one. I think that's why "gillean" in the recordings doesn't sound like "geelyan". Pronoucing "gillean" in the normal way tends to make the tune more like a hornpipe than a strathspey.
   Something not obvious from the phonetics, and not very obvious in the recordings, is that the letter l, when adjacent to an a, o, or u, (e.g. in "balaich" and "lom") should be pronounced with the tip of the tongue against the back of the top front teeth. It's not always easy, (especially after "brochan") but I try to do it as best I can, having heard a judge at the Mod complaining bitterly about singers not paying attention to it. I get the impression that this isn't a regional pronunciation; it applies everywhere from Kerry to Caithness.