You seem knowledgeable, Mr. Vandelay. Perhaps you deal with imports and exports... if so on the topic of audio on DisplayPort, are you aware of any Receivers that will split the signal to send audio to speakers and video to your projector or monitor (TV but there are few)?
Serious question about the receiver if you do know of any - it's come up in the last week while seeing the Valve HDMI news on Lemmy. I found some projectors that have DP, but no receivers and hoping someone here can!