Nuphy Air75 Wireless Receiver does not work on Linux

I recently bought a Nuphy Air75 and ran into a weird issue on Linux.

The Air75 can be connected to the computer in 3 different ways:

1. Wired
2. Bluetooth
3. USB Wireless Receiver (comes with the keyboard)

When I connected via wired or Bluetooth, the Fn key would correctly work. That is, F12 would map to F12 and Fn + F12 would increase the volume. ¹ However, when I used the wireless receiver, the Fn key was never registered, and the keyboard would only send F12.

It seems for wired and Bluetooth, the kernel correctly loads the hid-apple driver, but for the Wireless Receiver it loads the hid-generic driver. The latter has no concept of the Fn key.

Any way, there is probably some complicated way to nicely ask the kernel to load hid-apple based on some USB vendor ID or something, but I’m not planning to dig into this further. I am just using it in wired or Bluetooth mode. I’m just writing this down because I couldn’t find anyone even describing the problem on the Interwebs. There are a lot of answers about using fnmode when using wired or Bluetooth. Nobody seems to have asked about the wireless receiver. Another fun tidbit is that all these new wave low-profile mechanical keyboards (Nuphy, Keychron, possibly others) seem to just identify themselves as an Apple Magic Keyboard when in their “Mac” mode.