Is OTG a requirement? Or just good to have?
I have a bunch of C3-mini boards and it would be great to finally use them for something more interesting than a temperature sensor.
Not really a requirement, you won't see USB section on the GUI. The capibaraZero is designed to support almost every device that support Arduino Wiring framework, so if a device doesn't support a feature, it will be hidden in GUI
I have not tried yet, so cannot vouche for the quality.
BTW their factory firmware isn't complete, it's just for testing purpose.