5.Can the BTR3K work as a DAC for the computer, and how?

The BTR3K can be connected to a computer and work as a DAC, which supports the sampling rate up to 48K/16b.
Use any USB TYPE-C cable to connect the BTR3K to a computer. Once the BTR3K is on, it would automatically work as the USB DAC mode.

It is prior as USB DAC . Therefore, when the BTR3K is working in both Bluetooth audio and USB DAC outputs at the same time, it would take the USB DAC output as the priority. By connectig it to the app the output modes can be selected in the settings menu.