That's a damned fine idea, it's a quick & neat rule that'll allow us to play around a little with the distinctions between Difficulty Levels without shifting an entire Level.
My experience with the Advantage/Disadvantage system in D&D 5th isn't so positive - there's a feeling around the table that, although the odds should be the same, the chance for success with Advantage is less than the chance for penalty with Disadvantage. As far as I know, nobody has checked to see if this is actually true or if it's all psychological but I do find that the rule itself has a middling to negligible impact on the game.
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