Thanks, I just did some searching and found that this was added in February 2018 - I think I gave up on my project in 2017 so it now looks like I could program something like what I wanted. I still have the source code so that's nice.
However I'm just thinking of getting rid of my Alexa devices anyway - I was discussing political events with my partner last night, spotted the Alexa device light up (I think I said "a letter") and noticed shortly after that I was moderating my speech and not referencing controversial topics. I later just set it on mute.
For research: have another device perform "audio fuzzing" of Alexa, trying random phrases. Use a camera to look for Alexa turning on. Bonus points, check the list of Alexa recordings (via web interface) to confirm 1:1 relationship between device activation and recorded file. Publish the inadvertent "watchlist" of phrases, monitor over time.
However I'm just thinking of getting rid of my Alexa devices anyway - I was discussing political events with my partner last night, spotted the Alexa device light up (I think I said "a letter") and noticed shortly after that I was moderating my speech and not referencing controversial topics. I later just set it on mute.