SimpliSafe Video Doorbell without pre-existing Chime/Doorbell

I acquired the SimpliSafe system recently. I installed all components except for the SimpliCam Video Doorbell. That installation of everything has been a breeze. Not so much with the installation of the video doorbell - it is turning into a real chore.
Called customer service and they told me that it would only work with an existing doorbell. Well, I don't have one - the house was not wired for a doorbell and uses a wireless one.

I am trying to get info on what components I need and how to install a chime with the video doorbell (what's a doorbell without a chime? and what's a security system without a video doorbell?).  I purchased a 16V transformer that will be used (per the SimpliSafe's recommendation to use a 16V one)

From my conversation with customer service, I gather that SimpliSafe is not recommending any specific Chimes. I did find out from the internet (user comment) that you cannot use a wireless chime, not even those digital chimes - you have to get a mechanical chime...

After experiencing how easy the rest of the SimpliSafe system is to setup and how well it works (very intuitive, quality components) I would really hate to return it, but I want to have a whole system that integrates a video doorbell with it.

The installation has started but its stuck - an electrician drilled through the front of the house, then ran a wire through the wall and through the subfloor into the basement below the entry way...I am stuck though, since I am just finding out that you need to not only power the video doorbell, but also connect it to a (mechanical chime).

If you have any suggestions please let me know what your experience has been. Any tips would be very much appreciated!!