I’ve done last night something very similar to this, a custom hierarchical taxonomy for med. anal. cat.; then created promos as a cpt, using same taxonomy, and a relationship with a hospital ctp; only thing different is that there, in promo, I linked through another relationship to a lab test cpt (every promo has one lab test related; and a lab has many promos, depending on the hospital). But I’m affraid of the performance, because I will use a lot of queries 🙁
