I honestly didnt think about looking into integrating an actual doorbell into the elk. Logically it would make more sense to have it as one as i wouldnt have to wire the doorbell transformer into a UPS and have a totally separate power supply for a light and a relay which would have a current draw of near nothing. When the only audible notification desired is a voice output from the elk itself.
Ive done many other houses with non illuminated buttons and or outdoor motions to chime for visitor notification. Most of which were prewired back to the panel location as dedicated runs.