Go live with Audio Only
Today, I am running the AV for a memorial service. I have a video that is piano music, but there's poster frame that says "Funeral Piano Music" throughout the entire video. It'd be great if I could go live with audio only.
Why don't you just separate the audio attach it to a blank slide. Problem solved
Use a black screen with no text or video, and add an audio track to it.
I think that's the nature of a video that has no video.
If there's no video on the video, convert it just to audio.
The audio can be played for any item under the audio function and you can assign a black screen or any other slide to it.