I have QC36ii's as well and I didn't know that I could use the headphones themselves to switch which devices are connected. I've always used the app on my iPhone to control this, which is problematic if I'm on a call on my computer and it's paired with my AppleTV.
Hehe! I can now understand why you went to th effort of reverse engineering! But yes, just slide the power button past the on position.
First slide will tell you which device's are connected.
Subsequent slides will cycle through the device's in what appears to be most recently connected order. Subsequent slides cycle to the next device and when you hear the name you want, stop.
Also, since two devices can be connected at once, the device you least recently connected to will be disconnected.
I have QC36ii's as well and I didn't know that I could use the headphones themselves to switch which devices are connected. I've always used the app on my iPhone to control this, which is problematic if I'm on a call on my computer and it's paired with my AppleTV.