The router supplies internet to the machine's LAN network, which is nothing new.
The tricky part is that the Ewon VPN device needs to have both a wired internet connection and a LAN connection with the machine network. These need to be separate since the Ewon's LAN and WAN IP ranges may not be the same.
So from what I've read so far, it might be possible to create a bridge between the router WWAN and WAN (or LAN) so that their IP range can be the same, and separate from the LAN network.
I'm hoping someone has experience with making such a bridge
Thanks for the replies. I most likely am overthinking it, so I will think about it some more and try to simplify it
There are big gaps in my knowledge, so I'm bound to be asking the wrong questions