Ok, I did some quick tests: video works, but audio does not.
I confess, my hardware combination is a bit special.
I have a beamer connected to one display port. The beamer has speakers, but I don't want to use them.
I have an audio amp connected to a different display port. The audio amp has a video processor, which is almoust broken yet. But stil sends control signals, that it can display video.
So I want to split audio and video on pc and then send video to one displayport (only) and send audio to another display port.
Audio should not care about cable settings and always use the same displayport.
My preferred audio format would be pass through - the audio amp plays all audio formats, that I have, so I don't want and don't need resampling or the like.
Would that setup be possible and could you shine me a light on how to do that?