Speculatively publishing this, but the entries depend on what the SPI transport reports.
My current version at https://github.com/DankBSD/base always reports `USB_PRODUCT_APPLE_WELLSPRING9_ISO` actually. The version is extracted from the HID descriptor, like [[ https://github.com/torvalds/linux/blob/b08968f196d498b19e9d0841d76a03862258f2d8/drivers/input/keyboard/applespi.c#L219 | this ]] (Linux `applespi` developers did not know this is HID, but now we know thanks to OpenBSD and Asahi Linux) and my current transport driver provides it as `HID_VERSION`.
But really bcm5974 should do it on its own.