The STM32L0x1 series has just a bit more at 0.9 uW (stop mode + RTC), but it gets you a full microcontroller. I am unsure if we have enough of an energy budget

The STM32L0x1 series has just a bit more at 0.9 uW (stop mode + RTC), but it gets you a full microcontroller. I am unsure if we have enough of an energy budget to get us some display (e-ink likely) (and the MCU also needs some extra energy for the updates) though.