I don't think it would be too difficult to get a plot to exist in that type of structure. 
  
  
Initially, the game would be exploring the Master/Apprentice aspect of the Force during your training, but your training doesn't even need to be that huge of a part of the game, and can be streamlined like metadigitial suggested. 
  
The main plot would focus around which ever Master you have's desire to investigate Revan/the Exile.  And you don't have to have grand scale differences between both ideas, as there'd likely be a lot of overlap of areas and whatnot between the two. 
  
  
  
And thanks for the kind words metadigital..... 
  
Seems as though Darque isn't interested in writing the middle though :D