ELIMINATE built-in microphones and cameras
Add a microUSB or USB-C plug on top of notebook displays and monitors, and sell a separate, flexible little accessory with camera and microphones to plug in, WHEN DESIRED. Delete 'built in' cameras and microphones and other sensors.
Most times, built-in cameras and microphones are INSECURE. Otherwise, a physical switch to visibly, physically disconnect such devices.
Similarly, even for tablets, these sensors should be plug & play, not hard-wired into the hardware. Include any 'GPS' along with external accessories. Make it slim and flush, but make it possible to make it GO AWAY.
A little camera and two stereo microphones, even molded to cute character shapes can be trivially plugged in for the one time in thousands that you want to 'teleconference', and it can be absent all the other times when it's possible for leaky, daily-compromised operating systems and software to grant access to creeps.