Inverted damage if undead fix poison bug help

I was using MasterZed's Invert damage if undead bug fix (makes Seizure heal the undead) and I noticed a bug with the fix, if an undead enemy with posion absorption were to be poisoned, the poison status would cause damage.

Basically I'm looking for a way to have Seizure still heal the undead while making sure the poison status doesn't  damage undead the enemies with poison absorption (basically poison status won't have the invert damage if undead flag).

I'd really like the hex addresses, I hope a simple hex edit could fix this (make Poison only heal undead w/ poison absorption while seizure & HP leak heal undead).

EDIT: Found out Phantasm/HP leak status & Seizure share the same byte, I want to focus on just making sure Poison status heal undead poison absorbers while Seizure heals undead.