Zaxis as far as i understand any jeti receiver R9 upwards can be programmed to have a ppm out on port 1. You have to read up un it in the jeti forums and update the RX to the latest FW. Second thought I think the R18 was always able to output PPM on SAT2. Its a RX setting though with a jetibos or it might work with a DC16 DS16 at its software based Jetibox.
If you can use the seperate spare channels though on the RX for normal pwm out once ppm is used i am not sure about. I think the R9 for example cant once in ppm out mode. But maybe further jeti updates will solve that.
On the otherside the A2 Fc offers the rerouting of any channel that comes in eiher s-bus ppm etc. to four physical port on the maincontroller.
That would mean i can ppm in onto the controller assigen 8 or more channles to the main DJI features and tell the A2 to reroute to physical ports another 4 channels pwm outputs, for landinggear or camera tiger etc. Here is another problem though that although A2 supports up to think 16 channels, ppm in combo with the A2 only allows 8 at the moment. Hope DJI will fix that !
Regards
Boris