FIRECAT1311'S PROFILE

So, basically, what I want to do is set up a script that can replace the standard stat gain on level up system with a system that gradually increases each stat individually as a character gains experience.
For example, if a character will get 5 HP and 2 ATK in their next "level up" and it would take 100 XP to reach that next level, I want them to instead get 1 HP every 20 XP and 1 ATK every 50 XP. Then if the next "level up" after that needs 200 XP they'd get 1 HP every 40 XP and so on.
However, I'm not really familiar with the scripting system, but from what I can tell the way it handles stat changes seems to be hardcoded in a certain way, and I'm not sure how to work around that. Also, while I more or less know the code I'll need to write to handle the formulas, I'm not sure where to find what variables usually handle the stat curves for each actor.
If there are already scripts out there that do the same thing, I'd be fine with using those as well; I just haven't been able to find any yet.

Edit: To clarify, I'm okay with having the "level" stat, level up messages, and things like that still visible, I just don't want them to directly affect the stats in any way.