What in the unholy fuck?
Yes, I suppose that's one way to do it. Or you can split it in multiple (2-3) challenges that are each let's say 60% of the difficulty of a 5 mask vision, to make it doable by everyone. Or you could have the option to do one challenge that hard, or multiple lower level difficulty challenges.
And no...I never once asked anyone to adapt to that level of challenge, I am open to any alternatives to meaningless, brain dead grinds.
And as for the closest we have in-game right now...have you never done Mage tower or other Legion activities in Suramar?