Disabling Voice Control, or at least muting it (iOS 10)

I have an iPhone 6S recently updated to iOS 10.0.1. Holding the Home button for about 1 second activates Voice Control, with a characteristic loud double beep. This is very easy to activate accidentally, which is especially undesirable if I am trying to discreetly check my phone during a meeting or something. It's also easy to accidentally push the button when the phone is in my pocket (and locked). I have no interest in actually using Voice Control at all, and it's very important to me that my phone not make unwanted noise. Is it possible to: - Disable Voice Control entirely? - Stop it from beeping when activated? (It doesn't respect the hardware Mute switch.) - Reduce the volume of the beep? (It doesn't seem to respect the ringer volume.) - Prevent Voice Control from activating when the phone is locked? (I would also prefer that unauthorized people not be able to use its features.) I saw https://apple.stackexchange.com/questions/124437/disable-voice-control-on-iphone-4s-ios7-1 which suggests turning on Siri. Indeed, Siri has options to disable access on lock screen, and to turn off "voice feedback", making it silent. But for privacy reasons I do not want to enable Siri. Since that question relates to much older versions of hardware and software, I am hoping that something has changed since then. (Also, unlike in that question, my Home button works fine physically.)