In the case that she doesn't, I propose making an Earth Diary for him, one for each book he's in, starting with #4 and excluding #8 since that one already exists.
I say this because I, for one, am quite interested on his comments on things like Terran politics (#6, #20-#22), traitors (#18, #22), the Chee (most books after #10 but especially #25-#36) and relationships (#26, #27 and #38 come to mind).