Saw a demo the other day of a Jeppesen flight package uploaded to a large-size iPad pro. You could fill out the flight plan with the stylus on the pad, and the aircraft position will appear on enroute e-charts as long as the pad has gps reception. This being independent of aircraft "mixed" position, you could graphically x-check the airplane position and correlate it with the graphical NAT track sheer Jetplan produces...
If you take the pain to get the hardware and describe a procedure in your OM-B, I'm pretty sure the authority would approve it....