There is currently a discussion on the Papers support forum about an upcoming update in the newest beta version of Papers 3 which will include support of Apple script.
I hope someone will write a script that copy all relevant information from a specific article in Papers3 (reference, cite key, Papers URL and all annotations) so that it can be pasted as a new note in Scapple.
Why someone else? Why not me? Well, I haven’t done any programming since when Pascal was transformed into the object oriented package Delphi. I grew up with sequential programming, using Basic, Fortran and then Pascal. Is it really worth while to learn Apple script?