Regarding the doorbell, one option you have is to try finding a second-hand Unifi G4 Doorbell (non-pro). It can be wired with only the two wires you already have. Just make sure you have relatively good 5GHz WiFi reception near your front door, because the 2.4GHz antennas on this model are notably bad.

I’ve been watching the wifi G4 doorbell like a hawk, it’s just perpetually sold out 😂 eBay listings aren’t any better, being even more expensive…