Gramine is not soluble in naphtha, meaning an extraction procedure will easily remove it. You can't rely on just any old patch of wild Phalaris to contain anything like a measurable quantity of usable alkaloids, however - and the plants are subject to not only seasonal variations in alkaloid content but also variations in content depending on the time of day that it is harvested. Phalaris can be quite a work of dedication to building a relationship with the plant - at least that's what I've seen with the folks here who've worked with Phalaris over the years.
If you did have room for a small tree somewhere indoors over the winter Homo Trypens' suggestion of Acacia acuminata is a pretty good one. That would be a matter of tracking something down via seed merchants or plant nurseries. There's also the Share The Seeds (STS) forum that may occasionally have things of interest come up.
Edit: you might not get your vaping technique perfected in just one try so aiming for a single breakthrough amount - well, it would be very lucky if you succeeded in achieving that! As for mushrooms, take a look in the mushroom section of the forum. Most people start off by growing some variety of Psilocybe cubensis.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli