I would love for there to be a solution for this, unfortunately for that to happen, Microsoft will need to fire the team responsible for Audio and Hot Plug and start from scratch. The entire sound subsystem has been designed to be as obtuse as possible, and to frustrate users at every opportunity. It's simply not possible for a competent software engineer to create this mess unless it was by design. Microsoft does employ competent people, 1+1=2, it was deliberate.
You can't even disable these devices in Device Manager, because they come right back when the displays wake up after going into sleep mode (The monitors, not the computer.) Again, this is deliberate, you are not allowed to permanently disable a device.. The Don't Allow option in Sound has the same problem, the setting is reverted by Windows immediately. By design. It's caused by the how the hot-plug subsystem deletes those preferences when it detects the device being unplugged. When the device wakes up, it looks like it's been plugged in and Windows detects it as a Brand New Device rather than remembering it, and that that you had disabled it. Of course all these devices are serialized (hard coded unique ID) so no need to forget, but forget Microsoft does. Again, by design.
As Microsoft is perfect, the engineers incapable of making bad decisions, this will never EVER get fixed. I know this doesn't actually help other than letting you know you should not hold your breath for a solution, because it's not broken. It's by design.