To answer at least one of my own questions, the new Aeotec Siren/Doorbell driver does not use child devices. So in that configuration that's why I can't see them. The functionality that I could see is the complete feature set that is available at this time.
As mentioned earlier, the old driver raises a bunch of errors which make me think that maybe it was never tested (and now it's "old", so I guess that's that).
So if you found this thread while having issues with Aeotec Doorbell, use the new Siren driver and don't expect to see child devices. And there are various comments about setting up in that other thread.
