I bought a device called a "Tip Top Temp" which fits over the damper wheel on top of my Weber kettle BBQ. It has a bimetallic spring controlled butterfly valve which is adjustable. It controls the airflow through the BBQ by opening and closing as it heats and cools, therefore maintaining a constant temperature, which in turns allows you to cook "low 'n' slow" brisket, pulled pork etc. It ran overnight for me a couple of weeks ago, 14 hours in total, with no more than a +/- 20°C temperature fluctuation keeping it around 100°. Then, after the stall I adjusted the control to take it up to around 150° for the last hour. The best £40 I've spent on a gadget in a long time, totally analogue, brilliant idea. You can get them for other BBQs, Pro-Q, Big Green Egg, in fact any Kamado type BBQ etc.
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I'm IN.
The next time you see my partner, you're going to get a verbal dressing down...