I think regions where he is keyable are not thematic.GRIMA WORMTONGUE (METT) - CREATURE OR SHORT-EVENT
[MP: 2; P/B: 12/8]
Unique. Men. One strike. May be played keyed to any non-Heaven site in Rohan, Anorien, Dagorlad, Gap of Isen, or Ithilien.
If played as a short-event, it will force all characters in a company at a site in regions above to immediately make a corruption check modified by -1.
I don't understand why he is keyable to Anorien (unless he was in charge to harass Woses), and Dagorlad/Ithilien, which are a bit far from Isengard.
On the other hand, it's strange he isn't keyable to Dunland and Old Pukel-land, where lots of Dunlendings dwell, which are close to Isengard.