Hi,
I don’t know if your topic is still up. I would suggest a tool named “virtual audio cable”. It lets you create virtual recording and playback devices that can be freely connected to each other.
The only requirement is, that you can send the output of each of your applications, you want to stream, to a specific sound device.
If this is possible you could for example:
playback device ->virtual rec device 1 -> virtual output device 1 (set as default in windows)
capture device ->virtual rec device 2 -> virtual output device 1 (set as default in windows)
Not sure if that is what you want, but you might check the hp of vac: https://vac.muzychenko.net/en/
Mr Flow