If someone have the interest and Python coding skills then perhaps this SDK could be made into a Kodi service addon for voice control?
Google Assistant SDK developer preview is available for download, initially optimized for the Raspberry Pi, but there is also support for x86 and the library looks to also be portable to other platforms too:
Basic hardware requirements - Before you begin, you'll need the following components:
- A device running on one of the supported platforms, with internet connectivity
- A microphone
- A speaker
PS: I guess for it to get a more high wife acceptance factor you would either need a microphone on your remote control for Kodi or buy/build a microphone array device, like ex: