Multiple body cams that cannot be disabled are the quick route to reducing misconduct.
Good cops will love them, bad cops will hate them.
Only a court order should be able to decrypt the stored video/audio.... this is needed as officers should have privacy when not directly engaging with the public. Only the time period of actual confrontation should ever be decrypted.
I’d hate to be a cop sitting in my car chatting with a fellow officer over lunch and worrying about who might hear our private conversation.
Your idea sounds very reasonable.