Disable Bluetooth Keyboard and Mouse prompt But keep Bluetooth pairing enabled

Hi All,

Can't seem to find the solution to this anywhere. I have a mac mini that runs an installation at our museum. It auto starts everyday and when it does it prompts that no mouse or keyboard are connected. This halts the startup process. I know that I can disable the bluetooth prompts in bluetooth advanced settings, but I still want to be able to connect a wireless keyboard and mouse when I turn them on as the mini is hanging from the ceiling out of reach.

How on earth do I disable the keyboard and mouse prompt but still allow for bluetooth keyboard and mouth pairing?

Thanks,

Andrew