Yeah, but in Highlander the movie Connor can pretty much exist under water without needing to breath (as demonstrated when Ramirez throws him into the water.)
I say the comic should throw out the concept of Duncan, which was necessary for the series, but is quite stupid, and makes immortals too much of a common thing. (Two immortals in the same clan, when it supposed to be 1:1000000. It should be a big deal if one of them kills another, so we don't have dumb things like the police never finding a connection to Duncan's dozens of victims)
What they should do, is consider only parts of the first movie cannon: the rules, the lower number of Immortals, the flashbacks, and characters (cynical Connor, Ramirez, Kurgan, Rachel, Basil etc.).
Then use some elements of the TV series (Watchers, Methos, etc)
And finally use one element of the third movie: the very rare special abilities that you can get by offing special immortals (like the illusion magic of Kane)
Keep some homages to other installments (mention of Kell, or the idea of a shield against solar radiotion and stuff)
This way you get the best of all worlds and have a world rich enough to support an ongoing for decades.