While you could do that, It's probably not the best way... (and remember that a loss of AP's needn't necessarily represent injuries either).
I'd treat them as equivalent to a 1 use "Healing fetish", although not necessarily animistic in nature - Give them an appropriate rating dependant on the power of the potion/salve. You can use them after a contest in which you have been injured in the same manner as (for example) a Chalana Arroy or Bevara cultist would use a Healing Feat, or, if you are loosing AP's and need a boost then you can take an unrelated action to "Loan" AP's from the potion to the hero.
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