I wonder if that sort of library compatibility might be the reason for the shortages in those particular part lines?
It looks easy to find STM32L0x2 chips in stock. Those are not supported by the QMK firmware, but they are very similar in terms of peripherals and features to the supported (and hard-to-find) STM32F0x2 lines. The main differences are a lower minimum operating voltage and more power management options, IIRC.
It looks easy to find STM32L0x2 chips in stock. Those are not supported by the QMK firmware, but they are very similar in terms of peripherals and features to the supported (and hard-to-find) STM32F0x2 lines. The main differences are a lower minimum operating voltage and more power management options, IIRC.