Remote Camera via VPN?

I’m not sure how this response should help… the question is if there is a HA solution which does the “Networking”.

As written: When my Laptop uses the Wireguard VPN client, then the Camera (remote LAN) is reachable (but the Laptop is not reachable the home LAN anymore)

Now HA should do both: still reachable for home LAN, but at the same time having a Wireguard Client running and a steady VPN connection to the (remote server and) camera stream (from the remote LAN).

seems to go in this direction, but in my case the VPN Server is not in my control, but an ISP-provided Router (I cannot enter a “PUBLIC_KEY_HASSIO”).

But on fact the remote CAM does not need to access HA, rather the inverse: HA should just display the rtsp stream which is broadcasted anyways from the remote Camera to all devices in the remote LAN (=to HAs VPN Client).