[zoobab]

If you can set different fixed channels on different transmitters, you could use Multipath-TCP routers to aggregate multiple routers:

https://github.com/Ysurac/openmptcprouter https://www.openmptcprouter.com/

I mentored the port of MPTCP to OpenWRT years ago, and OpenMPTCPRouter took some of this work in their port.