Just wanted to update my situation regarding this feature request
I've retired my Vive and the wireless adapter and am now using a Valve Index. As I'm again on a cabled headset I thought I would be rid of having to restart the audio engine restart every time I want to use it, but alas, a different issue has surfaced.
The Index sends audio to the headset over DisplayPort, this means it's using the NVIDIA High Definition Audio device provided by my GPU. This device is removed from the list of available devices every time I turn off SteamVR, I guess as the device is not in use anymore as the headset is powered down. This results in VoiceMeeter (Potato in my case) not automatically using the device when it connects for the first time every session.
To work around this problem I manually re-select the device in VoiceMeeter after starting SteamVR. As a side note, if I restart SteamVR which causes the device vanish and reappear in VoiceMeeter, it will start using it automatically, I only need to manually choose it once per Windows session.
I'm not sure it the device gets a new hardware ID or something every time I start my PC? If there is any more information I can provide regarding this I'd be happy to help.