So off I went to the local nursery and bought seeds (plus a meyer lemon tree) and spent way more than I really needed to. Impatience is expensive and lonely as there are many local seed-swaps that I could have participated in if I had been smarter!
However, this is what I have planted thus far:
This is a space atop the worm bin and instead of the vague mushroom log I envisioned, I found this mushroom kit for shiitake mushrooms at Homesteader's Emporium. It lives for now in a plastic pot atop a dinner plate, but I'm sure I'll find a nicer house for it soon.
And if you like referring to the base plan, this is where the worm bin and the plants etc atop it live in relation to the rest of the Balcony Permaculture Food Forest: