@Lomtevas Thank you, your answer is very helpful.

@Lomtevas Thank you for the answer, though it doesn't answer the question. Phrased another way. If I set up the router as VPN client. Will all (WAN) traffic go through the VPN or is this configurable...

@Cyberlexie Is this VPN client an all-or-nothing setting or can one selectively route through the VPN based on some criteria e.g. subnet/ip, vlan, device, etc?