Hi,
to you main question - as you possible know (or also not), we don´t support the RealityXP GNS format because this is a protected format from Garmin, which can also be used in real GNS facilities and that´s not allowed according our contracts with our data provider.
So, we can´t really give you an answer here. Possible you ask RealityXP if this is possible or not. This is more a question of the addon, if this is possible or not … sorry for the “bad” news, but also we have a few restrictions what is allowed and what not.
In this case, we may not offer the data/the data format …
Cheers,
Richard