Newbie needing advice - Navio2 on RPI3 with dual Static IP Verizon Jetpacks

Congrats on quick results!

Navio2 only supports PPM and SBUS inputs, it does not support SRXL.
As a workaround you can use Spektrum-compatible receiver that is able to output SBUS. Seems like OrangeRx R800X is suitable for that purpose. Pixhawk wiki says that it is able to output 14 channels over SBUS.