Just Something to think about - have you done any market research on potential customers regarding database updates?
My personal view is that I'd rather use XP11 or P3D built-in GPS units with current data via Navigraph and fs Aerodata than higher-functioning units with old data. Its the only thing that's prevented me from looking at RealityXP or F1.
Food for thought is all - certainly not everyone has the same criteria for the value-add of certain sim add-ons and I'm sure most of your customers are quite satisfied. I'll be on the lookout for if & when those updates may be available :)