Here's what I'm trying to do. Right now I'm playing a human swash/mage, and I just got to chapter 3. I want to use Shadowkeeper to change him to a cleric/mage. What I want to do is change the character in a way that it would be like I've been using this character all along (without having to restart the game). Even though I'm using a hacking program, I'm trying to make this as non-cheating as possible (I won't be boosting xp to even out levels or anything). Can anyone offer advice on this? Thanks.

you can switch classes at any time in the game and it will make the necessary adjustments. It will be like you played the entire game as the new class up to that point.