The mini-games for diplomacy, infiltration, skirmish, and warfare (mass battle) could be used with minimal modifications for your Fate Core game! They'll provide tactical alternatives to the conflict system when you want some variety!
The book has six different factions, with a number of leaders and quests, which could be used easily. Additionally, there are numerous threats and regions to explore which have monsters, minions, and enemy stat blocks all ready to go!
Even the development system could be used on top of a more traditional Fate Core game. The developments could function more like stunts that everyone in the group could leverage. Instead of the structured mission system, a gamemaster could control what happens to the Stronghold.