Great review! I wonder, have you tried using the Alexa/Amazon app by itself, without the Viva? I haven't myself, but it seems like it should allow most of the same functionality. The only thing I'm not sure about it is if it supports waking with the Alexa keyword. Myself, I just use Google Assistant when I'm in the car, which requires no additional hardware and can be set up to wake on keyword, but I think that only really works with Android phones which have it baked in.