I know this idea is dumb, but I’m not sure why. As I understand it, one of the biggest drawbacks of drum brakes is heat dissipation, and one of the biggest problems with ceramic brakes is that they have a hard time getting up to temperature.
What if you use a carbon ceramic material in the drum and insulated it so it stayed up at the optimum temperature. There could be flaps and vents to prevent overheating and you would always have awesome stopping power. This is probably a bad idea, but I’m not exactly sure why.