what do you mean by off network? on the wifi of a different home's network, that has internet access?

the wireguard client on your laptop is supposed to give the laptop (and the laptop only) access to your home network, and the reverse proxy running on the laptop is supposed to give local devices access to services at home selectively, by listening on port 443 on the local network, and processing requests to services that you defined, by forwarding them through the vpn tunnel.
this requires that a machine at home runs a wireguard server, and that its port is forwarded in your router