I think a more realistic, although perhaps less engaging option would be more like a management simulator. You probably know about games like Civilization, or probably a better example, Football Manager. In these games you make choices as an overseer to help better your team.
Perhaps in this DCI simulation you play the Corps Director, handling funds in the off season, initiating fundraisers and recruiting campaigns, scheduling audition camps, all of which can have a positive or negative affect on your corps. As we move into the start of the season, perhaps take in alternating roles as different caption heads, choosing different things to rehearse, possibly picking from a set book of visuals to put in different spots, or maybe even given the option to change horn parts, add guard work, and clean percussion parts, perhaps by pressing a series of buttons in a given order. Once you get on the road, You take back your role as director, or possibly tour manager, managing problems, addressing bus breakdowns, spending money to feed the corps, and monitor the corps as a whole. You'd switch back and forth between admin and instructive roles to keep training and preparing the corps for finals, where the sum of your decisions and training results in a computer generated score.
Obviously some key details missing but that's my little bit of thought for it.