I've seen a few people mention this, but none seem to mention that it's a Runtime crash, and changing to DX9 hasn't helped so far. Admittedly I have no idea if swapping mid game is a good idea.
Loading an earlier autosave also doesn't work with either version, so I'mma assume that unless there's a dev console log somewhere or something, that I should disable it and just have the mod on whenever I want to play as him.