I'd like to use zero PID for my USB device but I'm currently unable to do it as it's forbidden by the following code:

According to https://stackoverflow.com/questions/30098394/is-pid-0-a-valid-for-usb-device, PID == 0x0000 is a valid PID, and the accepted answer there contains a link to a list of existing USB products, some of which have zero PID.