Point of Order: FLARM isn't a database to be accessed on the ground; it's a live system similar to a (basic!) TCAS that gives you real time info in the air.
Granted, only for those aircraft (yes, mostly but not solely gliders) that have it fitted, but that's a fair proportion these days - and hey: Every little helps, no?
PowerFLARM shows up Mode A/C/S transponders and ADS-B, too.
Agree with much of your 'paper-safety' thoughts, though.