I was initially thinking to use the abilities/skills section for AoKs but I just saw a minor problem with that because it's an under the value roll as opposed to add the value roll.
There are 42 areas of knowledge (between both the core book and companion), every AoK has an independent value. Superiors will range from 50-130 (starting) up to 150, standard AoKs will have a value equal to 1/2 the starting knowledge. Then any one of those values can be raised from points that are derived from raising knowledge with XP. So you could eventually end up with all 42 AoKs having different values.