You say intervention, I raise you a Daishoku or Daijuu Prim who can cure the mild effects of Hanahaki and isn't afraid to crit a man in the head with a healing spell if he's being stupid. She might also scold him about crimes if we wanna roll secrets.

RE: Secrets, btw, I got your connection making hanyoukai right here in Setsura. She can sense that easy and the lab-grown part tbh.