Weathercock said:I'd use the tweaks tool
you can't as you assumed correctly. You would need to use this mod game code, not VC game code.
If you need to apply tweaks to this mod check the Tweaks thread, you may be able to figure out how to use them here
stats loss (should be easy): https://forums.taleworlds.com/index.php/topic,323613.msg8153242.html#msg8153242