I’m aware that the navio 2 requires ppm signals to work, I don’t think i can buy the recommended receiver listed in the hardware setup page. However on searching for the manual for this transmitter here. http://manuals.hobbico.com/fut/9c-super-series-manual.pdf
It mentions that the transmitter can transmit in both PCM and PPM. So would configuring it to send in PPM make it work with the Navio 2 ?
no, I use SBUS with a TARANIS X9D and Navio2 very successfully without any problems and any additional hardware (but you need to buy a separate receiver).
Have a look at this to get an impression why the Taranis is great: