Hello, I think you may have to find an USB bluetooth dongle which supports 'HID Proxy' mode (effectively the bluetooth stack is on the dongle and the motherboard then sees the dongle as a standard wired keyboard).
Is there any way I can add a basic driver to the UEFI for my T7920? Specifically, I use the Logi K860 and MX Ergo as my keyboard and mouse. Both are Bluetooth and use a generic USB Bluetooth transceiver plugged into the back of the T7920. Unfortunately, UEFI doesn't appear to enable the Bluetooth adapter so I can't interact with the system before Windows boots. Thanks for any insights.
Adding a driver to UEFI