I have a few books on various subjects that I think would make some very good props/real learning experiences. Books on organic chemistry, biology, astronomy, the usmc sniper/scout manual.
What I propose is using these as sort of training manuals and guides. Stick an qr code in them, 30mins to a hour of time and then rewarded with AP.
This would help advance certain skills that may not have a very well represented in game advancement, like a book or guide on excel could boost Administration or Logistics, a book on circutry could boost computers.
And books covering more than one subjuct could give smaller rewards to both subjects coveres. Like the scout/sniper guide would be firearms and scouting.