Not sure I follow what the problem is. If the DAC is internal, then the output should be via analog RCA jacks. If you’re looking at an external DAC, then same thing – the outputs will be analog RCA. If you want to get signal to both desktop speakers and the remote receiver, then all you need is a pair of RCA splitters.
BTW, Welcome to the Forum!
Regards,
Wayne A. Pflughaupt