Multicast with EoIP without polluting other subnets

Hi all, I’m facing an issue trying to connect IP TV on two distinct sites while having also other subnets that should not be impacted/polluted.
Here is the set-up:

Site A (RB4011iGS+)
receive the multicast from ISP
dedicated VLAN 3 where multicast feed is broadcasted and IP TVs connected to it

Site B (RBLHGGR)
also has a dedicated VLAN 3 for the IP TVs

Sites interconnection
I’ve set-up a VPN IPsec tunnel between the two sites

Issue is that if I set-up an EoIP tunnel then it should be on a dedicated bridge on each side in order to not pollute the other VLAN. For each sites I need to send all VLANs including VLAN 3 on the same physical interface but I can’t trunk all VLANs as they are running on two separate bridges.
Any idea how to make it work ?

I’ve attached a basic drawing of my set-up to help understanding the case.
2021-10-06 10_08_44-Window.png