Probably not 100% what you're looking for but this is the aura I use on my Paladin. It will always be visible but shows you when to refresh/not to refresh based on your current Vengeance/when it's not on you.
Code:
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Stole it from this guy since it filled what I was looking for.
More to the point though - using Full Scan you won't be able to set it up to display with "X" time left on the buff without it being a full custom code with untriggers, etc to track the ability instead of using the base "Aura" setting.
G'luck!