Tell them the smart home feature is coming “in a few weeks” 
Seriously, I’d leave off the automations for now. I’d say you can still go keyless. Provide them with instructions on how to set their own pin for the smart lock. You should be able to do that with just the lock, no HUB needed.
Once ST sorts out the add user stuff you can add in all the fun stuff. Also, can I work for this apartment complex? Sounds like a fun project!