Sadly, it's impossible
.
Actually in
this thread I was trying to solve out the same task which you're asking about . There's no way to manually edit simulation of the one particular game. It's also impossible to manually edit the score and game stats of already simulated game. Although you actually can export from saved game to .csv files all the data you need to do this and even edit them but it seems there's no way to import this data back into .dat files of your saved game.