I feel like we should reintroduce universe alteration into fandom circulation as a term, because all too often i see people calling things that directly contradict canon headcanons and that ain't how it works!! You're pretty much making a mini AU which is what the UA term is for, everyone wins! Just because headcanon has the word "canon" in it doesn't mean it makes anything more "real" 😭 All of these terms like headcanon, AU and UA fall under the "transformative works" umbrella, we're all playing toys in the sandbox, it's fine!! Anyway that was my Old Woman Yells at Clouds moment, yeah it's a ☝️🤓 ass kind of complaint but whatever..