I've spent too many playthroughs after unlocking Clanlord and Malcolm trying to fight The Corrupt and Xan only to face The Skaarjs in the finals time and again. Is there a way to edit the save file so it's a guarantee that I'll fight The Corrupt in the finals?

And no, what I'm aiming for is not to unlock Xan which can easily be done by methods already known, but rather to have a save file with me facing Xan at the end.