And you don't need the old style of discipline. A quiet word early and treating pupils as individuals will earn enough respect that little more is needed.
You're away with the fairies!
Nonsense! Teacher assessment is so strict nowadays and getting stricter that any straying from the official curriculum egts you crucified for your troubles. Pupils like it. Headteachers do not. Pupils even get angry when they realise what rubbish they are being fobbed off with after one has been "creative enough" to introduce them to adult quality learning materials rather than kiddies pretend stuff. (I tried classes with The Ring of the Nibelung, the Classical roots of our culture, classic films with an ethical/social relevance etc. All of these, the kids loved, and were angry that they did not get them on the regular syllabus, but I had to keep my head down and was even reprimanded at one point, for going outside the official curriculum.)