Sorry, I can’t help with that, but if you’re looking for a device to play notifications like the ones you mentioned you should check out the Aeon Doorbell.
It’s only about $50 and you can save up to 100 mp3 files on it and play them by track number using Rule Machine. I used a free text to speech website to generate most of the mp3s I’m using.
It has a few quirks, it’s not very loud and it doesn’t work well as a doorbell, but once you get it setup, the mp3 playing functionality works great.
A custom device type has been created for it: Aeon Doorbell Type Beta