Asaf Bartov, 07/03/2014 22:49:
Another version of this that has been tried by WMF, more similar to Charles's second suggestion, is documented here: https://en.wikipedia.org/wiki/Wikipedia:Geo-targeted_Editors_Participation/r...
Uh. Thanks for linking. Being on en.wiki, basically orphan and uncategorised, it's impossible to find.
Nemo