Not my area of expertise - but a deserted flat stretch of bedrock sounds perfect for building a major pipeline. Nobody living there means no issues with locals. Build it elevated (like the US's Alaska Pipeline) - so no issues with excavation. Surface bedrock makes support footings trivial (vs. Alaska has to deal with frost heaves and other soil issues). Road building is also pretty trivial.

Google Maps says it's <1000km. Easy enough for Canada to put out a RFP, noting "don't bother us if you think it'll be over C$25 billion". That's C$1M for each 40 meters of pipeline, at scale. Maybe you want 6 pairs of footings per 40m? Sounds like it could go up darn fast, with the footing crews working a week or two in front of the pipe crews. (And building it fast also minimizes the supplies you have to haul in & out in an area where, as you noted, you can't lean on local water & sewer & electrical service, and the corner hardware store for a odd-sized wrench you just realized you needed:) Meanwhile, a few Nordic shipyards are building the icebreakers, and another firm is digging the new harbor and channel on Hudson's Bay.

Vs. in mountains - yeah, roads are a big issue there. Because the roads themselves can take years to construct. And still, being a mere 1/2 km from the road isn't much comfort if that is up and down sharp slopes - which will mean soil stability and erosion and pipeline pressure issues, every meter of the way.