Whilst some-what unrelated to reforms, that is a very ambitious project. It will be very hard to display all that change, with the factions such as hellenic, eastern, roman tribes, the split of the empire and barbarian tribes into 21 faction slots, as well as the hardcoded number of units. Also, because of the roughly 1200 years between end and start, one would have to play the game exactly to history to make sure all empires come out the way they do.