Betaflight doesn't really care about what Radio receiver you're using - as long as it can talk to it over uart (/SPI) via one of its supported protocols like cr

Betaflight doesn't really care about what Radio receiver you're using - as long as it can talk to it over uart (/SPI) via one of its supported protocols like crsf, ibus, sbus etc.. If you really want encryption, you can simply use a PiZero that talks CRSF to Betaflight and has an encrypted channel to your ground station over 4G LTE/Wifi/Wfb-ng/what not. But if you're dealing with 4G and PiZero, might as well use Ardupilot + mavlink. Those tools already support this use case much better. Betaflight is more of a proximity racing drone kind of use case. Only recently did it's GPS return to home functionality got some improvements.