Somebody needs to write a Pi2 software routine to output NMEA plus whatever weather format LX Nav is accepting. It seems to me the traffic data needs to go out on a serial port and the weather would be via WiFi hotspot since that is what LXNav is using. I doubt they are in a hurry to build something that would only work in the US so you'd need to spoof what they are delivering via cellular data and WiFi hotspot - assuming it's not encrypted.

You'd need ADS-B Out with the right configuration to get TIS-B except for the random output meant for other aircraft.

9B