Actually, it looks like if you connect to the brain3 over WiFi it automatically routes the telemetry over WiFi, which should do the job. Using an application like ZeroTier https://www.zerotier.com/ to bridge an onboard wifi connection (4G dongle, with Brain3 as WiFi client, or 4G directly connected to Brain3 via USB), to the computer running the GCS, should enable long range
With the Brain3 using a linux distro, using a 4G dongle directly connected to it via USB should allow for a fairly stable connection (pending 3g/4g reception)
If anyone has any feedback about the above, it would be greatly appreciated. EG if anyone can see any issues with the network topology, or how the Brain3 will go with sending telemetry and receiving RC Override commands over a network connection.