Assign Wireguard interface to a physical LAN port

Installing and Using OpenWrt
2

I do not have your router so I am not 100% sure (there are routers where the switch is not configurable)
But usually this is possible.

You need two things

  1. Policy routing to route only some clients/interfaces via the VPN e.g.
    Policy-Based-Routing (pbr) package discussion

  2. Setup and interface for LAN port 4. It is largely like a guest network but instead of configuring a wireless interface you set the LAN port 4 to the created bridge.
    How to do that is dependant on your router and you have to look that up or wait for someone to chime in
    https://openwrt.org/docs/guide-user/network/wifi/guestwifi/guest-wlan

Then with Policy based routing you route that newly created bridge with its LAN port 4 via the VPN.

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