Is this a stupid idea?
Run a local version of Netbox so that even if offline you can have your system diagrams on your troubleshooting device.
No I have never worked with Netbox, but I see the value to documenting your system with it. Every connection, every power cable, etc in the palm of your hand, even if disconnected. Looks like it needs more than a simple LAMP stack, not sure if a pi4 with 8GB would be enough.