The package should work in other internet-connected & sound-output-capable devices. I added some features for my purposes and decided others may find some benefit in my effort.
After studying a few other voice options I decided on IBM's Watson because of it's high quality cadence and intonation. I'm using the AIY Voice HAT, but I was very displeased with the robotic-voice that's supplied by Google.
I created this interface for a voice-based-bot that I'm running on a Raspberry Pi 3B.