I play No-Reload with SCS/Ascension. I have no time for those shenanigens, way too risky. ToB section is *ludicrously* hard with those mods.
Regardless. That helmet is in BG1 only, not in BG2; although you *can* get Viconia to Neutral through Romance.
Which, admittedly, suits her better to begin with. She never does something truly evil in-game, is loyal to a fault and the only evil things she does story wise is in self defense, againt other evil people. Slaying evil is parmitted in AD&D, and essentially, good.