There is no such thing as dump router. What you describing is in fact a switch.
You could tag eth0 or eth1 for VLAN 2502 (probably eth1 for load balance) and then if your TV is wired then you could just turn its LAN port off on VLAN 1 and set it to untagged for VLAN 2502.
Or maybe you could just leave all as in your picture and change the VLAN ID to 2502? I on't know if that could cause any issues, but it's an idea.