The XRX supports a few 'profiles' for external EFIS systems. In my docs, profile 1 is for AnywhereMap, profile 2 for Trueflight. Garmin support only exists in V2.0 firmware, which is the last one released before Zaon went belly-up.
I will ask Avmap which Zaon protocol/profile they support, as they claim compatibility but their manual shows no info which profile should be selected. My demo uses the binary format described in a hard-copy Tech Reference manual from 2006 and not available online. This manual claims this binary format is 'Trueflight' mode.
Edit: The EKP-V manual *does* show which profile to use, they list profile 1. Their previous product EKP-IV shows profile 2. So they have switched, I guess?
Edit again: Avmap probably should take the opportunity to natively support $PFLAA/PFLAU traffic inputs. They have an external GPS antenna that is just a uBlox, so if they instead allow PAW to be the GPS and traffic source, they are all done.