How can you change Window's active recording device using C++?

How can you change Window's active recording device using C++?

Specifics on WHY I want to do this to help you understand my dilemma:
I have enjoyed the ability to change my recording device to stereo mix in
Skype calls so that the people can hear my audio. This is a useful tool
for sharing music/other audio.
I would really like to compile this into a soundboard program, so I can
press a button and have the device switch to stereo mix, play a sound, and
switch back.
Simple enough, but I cannot find a way to change the recording device
using a program.
This question is exactly what I would have wanted answered, but it wasn't.
How can I write software to play sound clips routed into the recording
device?
Also another thread ( Select recording device in C++ (Windows) ) taught me
how to find out how many recording devices I have, but without actually
telling me how to change them.
An acceptable answer is that there is no simple way to do this without
bypassing security Windows has in place.