I’ve installed Twister Os on my Rock 4C+
It seems to boot okay, however only the OTG USB port works and I have to attach devices to it using a usb hub.
The Discord is of limited use as they state Rock 4C+ is not supported (is anyone else finding that support for the 4C+ is minimal to non-existent?). It looks like the distro is everything I need but it it limited if not all the hardware is working.