This bash script can be used to generate the wireguard config from nordvpn nordlynx connection on a linux machine. I used this script to generate wg config for my Gl.iNet router vpn client

generate_wg_from_nordvpn_nordlynx.sh

#!/bin/bash

CONFIG_FILE_NAME='nordlynx_wg.conf'

nordvpn disconnect
sleep 2

nordvpn set technology nordlynx
nordvpn connect Netherlands
nordvpn status

WG_CONF=$(sudo wg showconf nordlynx)

LOCAL_ADDRESS=$(/sbin/ifconfig nordlynx | grep 'inet ' | tr -s ' ' | cut -d" " -f3)
PRIVATE_KEY=$(echo "$WG_CONF" | grep 'PrivateKey = .*')

HOSTNAME=$(nordvpn status | grep 'Hostname'| cut -d" " -f2)
PORT=$(echo "$WG_CONF" | grep 'Endpoint = .*' | cut -d":" -f2)
PUBLIC_KEY=$(echo "$WG_CONF" | grep 'PublicKey = .*')

nordvpn disconnect

sh -c "cat > $CONFIG_FILE_NAME << 'EOL'
[Interface]
Address = ${LOCAL_ADDRESS}
${PRIVATE_KEY}
DNS = 103.86.96.100

[Peer]
AllowedIPs = 0.0.0.0/0, ::/0
Endpoint = $HOSTNAME:$PORT
${PUBLIC_KEY}
EOL"

echo "  ----------------------------------------  "
cat $CONFIG_FILE_NAME
echo "  ----------------------------------------  "

Steps

1. Install nordvpn linux client. https://support.nordvpn.com/Connectivity/Linux/1182453582/Installing-and-using-NordVPN-on-Linux.htm
2. Log in to the client by running nordvpn login
3. Run above script
4. Add the generated nordlynx_wg.conf config file to the router following the steps here : https://docs.gl-inet.com/en/4/tutorials/wireguard_client/?fbclid=IwAR2SHMfcwwfoYRWa8xW1HfXEz0ZVlg0zMXAss4BKPlIXpcY3tH9pb32rXd4#set-up-wireguard-client