In his “On the gradual fabrication of thoughts while speaking,” Kleist was in turn musing on Immanuel Kant’s metaphor of the teacher as the midwife at the birth of the student’s thought. When stuck in developing a thought, Kleist recommends, find an acquaintance to talk at. No responses are required. The mere presence of the silent interlocutor, and even more so the imminent threat of losing their attention during lengthy stretches of boredom or incoherence will trigger, or so Kleist claims, the “fabrication of my idea in reason’s workshop.”
This sounds a lot like a broader case than rubber duck debugging, which is obviously not a "new" thing.