Ian's secure knot doesn't really make sense on such long laces anyway, and making it tight is not very easy because you can't pull to tighten further like you normally would.
The main advantage of Ian's secure knot is that it doesn't come loose over time. But you won't have that problem in ski or skating shoes because you will be redoing much more of the lacing every single time you put them on; a much tighter one at that. So the few hours you'll have your boots on shouldn't make a difference, and if it does, there's something else off in your lacing technique.