Unless the big blind would be getting 3:1 to call, my default play would be to open-push ATC from any position with those stacks. When you have the run-away chip lead, you should use it aggressively to accumulate even more chips, so that you go into the heads-up portion of the tournament with a huge advantage.
If you never bubble out after having a huge chip lead like this, then you aren't using your chip lead well. It takes quite a parlay of bad occurrences to knock you out, and it's worth the risk.
Your opponents are in a folding war. They are each hoping someone else will take a stand against you. They need a lot of equity against your range to take a stand, and very few hands have enough equity even if they know you are pushing ATC. When you see even two players in a folding war, you can usually steal their blinds aggressively.