How about a version for licensed hams?
70cm band. 433 MHz.
Higher Power, longer range…
Narrow Bandwidth Lora phy (7.8KHz), with either TCXO radios or maybe a frequency stabilizing feature for SX127x. I see that neither RadioLib, or RadioHead have this option so I am working on a basic frequency-correction loop…trying to think how to distribute a frequency reference over a mesh…
Mysensors RFM95 (from RadioHead) have a nice phy power-control feature in their transport, nice to neighbors (ATC). Also CAD, with random CSMA back-off routine.
Make sure the Lora radios get good power supply current when using higher power (>17dBm).
Use a NanoVNA to test and tune your antennas (many poor antennas out their).
I have a consistent 7Km link on 433MHz using the Low-cost RA-02 radios and outdoor antennas.