I love this, but also found it hilarious - especially the towel as a helicopter blade trick and your description of it being “very undesirable for the fly.” I’m picturing your partner or housemate sighing and being like, “there they go again, herding flies.” I can definitely see it working though.
I think “legalese” might be close to what you’re describing. It can still be ambiguous, but it seems to be our best attempt at avoiding that. Some forms of technical writing may also meet your definition.