Exguardi |
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As far as I can tell, you need Quick Draw to be able to attack with more than one alchemical substance per round.
Consider an alchemist or investigator dip in order to qualify for crafting alchemical items at 1/3 cost. Empiricist will let you focus exclusively on INT with a couple of levels.
It seems like the Scout archetype combines with Underground Chemist. Charging Hurler looks like a good way to get your sneak attack off; you could retrain it whenever you hit 8th level of Scout.
EDIT: Even without Scout, an extract or UMD'd wand charge of Blurred Movement should let you sneak attack very easily, as you gain concealment when you move, stealth as part of that move, and then break stealth with an attack. Seems like it works.