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Do what the pot heads do to extract oils from weed. Try mashing up the poison oak leaves into a mush to maximize the surface area. Steep the mush in plenty of butane (you'd need to have a chiller for this) or methanol. This should dissolve any oils in the leaves I would leave it in there for a little. Run the fluid through a filter and maybe a water separator but at least strain it to get rid of the solids. Gently heat the solution at the boiling point. This should remove the solvent and leave behind any oils that hang out in the leaves. This should be good enough for your purpose I am sure there are several typs of oils in those leaves but you don't need to isolate it into some kind of lab-grade shit.
