Since these cameras have microphones, could these be triggered when a sound of sufficient loudness or dB is detected?
If someone was handy with electronics I’m sure something could be jury-rigged to do that. Whether it would be worth the time, trouble and cost is another matter!
In my opinion it can’t be done, without a complete redesign by Blink, which they will not do. The entire principle of operation of the Blink system is that of incredible power saving, to give exceptional life out of two AA batteries. All of the audio circuitry will be completely turned off, until a normal detection takes place.
Could the mini do it, yes, will they, for a small niche type request, I doubt it.