Bypass OPNSense on a multiWAN setup

[vale.maio2]

Hello all, I'm running OPNsense 24.1.7_4-amd64 on an x86 device. I have setup multiWAN failover on it successfully, where the WAN2 is used should WAN go offline for whatever reason. If it makes any difference, WAN is provided by Virgin Media UK fibre (cannot put their router in bridge mode, so I assigned a static IP to the OPNsense box on the VM router and put it in the DMZ), while WAN2 is with EE fibre (same thing, cannot put it in bridge mode so DMZ it is). As I said, the failover functionality works wonders.

Now, I've been given a TV box from EE (WAN2 provider) which needs to be connected to their line to work properly. I did set up a firewall rule on the LAN for this client, so that it uses the WAN2 DHCP. I did test this on a Rapsberry Pi and, while the Rapsberry was still on the OPNsense subnet (.1.1) it was picking up the public IP address of the WAN2 correctly.

I've now changed the rule to assign it to the EE TV box (see attached), but it's not liking it. The box can see the network, but the subscription app won't work as the TV box doesn't think it's connected to the WAN2. I've been on the phone with EE customer service, and they advise that such a firewall rule won't work because the TV box is also looking for the router multicast (please don't hit me if that doesn't make sense, I know basically nothing about networks...).

Now my question for you is, is there any way to set in OPNsense this TV client such as it completely bypasses OPNsense itself, and gets handled by the EE router? All of this because my ethernet cables all connect to OPNsense, and I have issues with wifi with walls and such.