Intriguing!  So you need 100 points total?  For example, holding 2 locations for 50 turns (but only if you report)?
And there are six locations, correct?  The north half of the central island, and the 5 surrounding sea provinces - are there any others?
And you say no fortifying the victory locations - OK, but what if you get a castle via a spell or luck event?
Yeah, I guess I wasn't paying attention (or have forgotten 

 ) to earlier discussions of VP conditions, but it's getting to the point where it might start to matter, I think.