Mesh setup with 2 radios

I'm curious if anybody tried to setup 802.11s batman-adv mesh network with 2 separate mesh links on the same device.
Something like this: [router1]---2.4GHz---[router3]---5GHz---[router2]

My first idea was to just duplicate all the wireless & network settings on router3 and include the new bat1 into existing bridge with ethX and bat0. Not sure it's the right way.