I may be able to run an update to see if it will manually find and add stats to existing Slaves. For the most recent update, I can’t promise it’ll work right but it’s worth a shot after I get the next fix out.
Edit: However, like Ank is saying save games are editable. I haven’t tried but I’m sure that in the meantime you could grab any code in the person class and add it in. Just copy/paste whatcha need into the save file, then I would suggest setting expanded to False so any unassigned code will rerun (though it will altered already assigned code, so it’s a gamble).