Nah, that wouldn't do it.I don't know how to do that. I looked in the game save file, but for the game version variable there was a toggled value of 1/0 (I am assuming true or false). Would switching that to 0 have the same effect?
If the developer tools are working, then while playing, hit shift + d to bring up the developer menu.
Then type:
game_version = .22
Do that right after you load up the save file, it should fix the issue I recall. If that doesn't do it, or developer tools won't work, then you'll have to start from scratch.