Let's try a different tack. As a passenger if I stood up and said [ politely ] - Thanks, but I no longer wish to remain on the aircraft and I'd like to get off now. We're on the ground with engines off.
If the captain says no, then just ask for the Police to be called [ if in UK or Ireland ] Alternatively call them yourself. When they arrive ask for an escort to the terminal.
This of course assumes you REALLY don't want to fly onwards and your hold luggage is of little concern. Also the perhaps unwanted police attention.