Couple ways to do this I think. Pretty sure it would have to be before a new game.
The way I'd do it is use the editor to make a mod dependent on main using the editor and then copy/paste the stats files/folders from Data\Editor\Templates\Stats\Shared to Data\Public\GeomanerBairdotr(Or whatever you call it)\Stats
From there just edit the appropriate .xlsm files to your needs. The files in question are probably character.xlsm and skillset.xlsm. Scroll to the entries for Bairdotr and change the as required. Save and close your work, then open the all.xlsm file and run the macro.
Activate the mod and try it.
The other way you can probably do without the editor.
Take those same stats files as mentioned above and paste them directly into Data\Public\Shared\Stats. You might have to make the folders yourself. Make the changes to the same character.xlsm and skillset.xlsm files and then run the all.xlsm macro (there's a huge button, can't miss it).
Here you wouldn't have to activate the mod but it will semi-permanently change your main campaign until you deleted those stats files. I think this would break MP as well unless you were playing with someone who had the same changes.
