I would point out that an NVIDIA Shield with the Extend, Google assistant, and access to other Android apps would have all the antenna and potential ability to do all of this but homekit:
If you have a main hub that connects to zwave, zigbee, HomeKit, nest, google, amazon, WeMo, wifi and Bluetooth you have it all covered and your interface is the one everyone will use.
@fightingmajor…sorry I couldn’t figure out how to quote you.