Are you SURE that you're TOLD to make them dull, pointless and chaotic??
What makes them like this? The way you are told to use them [in which case, lobby for change] or the way you deliver them [in which case, seek some CPD]?
i am assuming, btww, that you are already fulfilling the full pastoral aspect - knowing who is PP, who is vulnerable, who is a young carer, who isn't making academic progress (and have sought to find out why), who has MH difficulties, who is in and out of care, who is vulnerably housed, who looks after younger siblings (or may be being drawn into the behaviour of older ones), who is on the radar for behaviour, who is chronically ill, who has SEN and its nature etc etc?
I am sure THAT can't be delegated to other lessons, so I presume you
have arrangements to check in with each of these children daily / weekly / at need, and to speak to parents / carers regularly, at the very least?