Two VPN clients simultaneously on one IP

Hi all,
first of all thanks to all for all the contributions, very helpful.
I have a problem with my tomato router.

I have two VLANs (br0 and br1) and two VPN clients:
1. Nordvpn (VPN client 1)
2. VPN server from a raspberrypi in my hometown (VPN client 2)

I have a specific IP which I put in the routing policy of the Nordvpn client configuration which is correctly redirecting the internet traffic.
The problem is that I would like to have access to the LAN only of the VPN client 2 and not...

Two VPN clients simultaneously on one IP