Altering max health/mana formula for players: possible?

[iRFNA]

I've been considering creating an EQ server that has diminishing returns for all item/spell added stats based on the total used (but NOT base stats) and removing all class based formulas for the calculation of health and mana, instead using one based only on stats. Anyway, the only thing I'm not sure about is a way to make the client recognize the new HP and mana values. I'm guessing this could be done with some sort of hacked AAs? If it's impossible, I guess I can just "fake it" by altering all damage taken/mana costs dynamically to use the % from their EQ client calculated pools that would have been taken out of their "correct" pools, but it's so ugly. Any advice? I'd also like to mess with regen values as well, but I'm also not sure if that's possible...