Hi @BAM,
You could use a dry contact z-wave sensor if there is enough room in the housing of the locking mechanism for two contact leads.
Something like this:
https://www.amazon.com/Aeotec-Aeon-Labs-ZW097-Contact/dp/B0155HSUUY/ref=sr_1_1?ie=UTF8&qid=1504805282&sr=8-1&keywords=dry+contact+sensor+zwave
It has two ports for wire contacts to test when the tung of the lock is in the right posission.
And you can setup a tablet with an ActionTiles loaded on it to display the status of all the sensors. Sort of like a Security Panal.
