Multiple clients

Hello,
I have installed openwrt on VPS KVM but i have some clients where can't insstall wireguard client and i want use another router Netgear R6120 whre i want to connect all that clients trough Netgear to VPS. How i can asign for each lan ip a client wireguard ?
Eg 192.168.1.138 to 10.0.5.15 (ip from client WG)
192.168.1.136 to 10.0.5.15, etc