So I made a new character, one that can solo easier but still be a tank and not be kill on sight to all of Norrath. So I made a paladin. You can follow along with my gear using the magelo link, I'll try and keep it updated.
https://eq.magelo.com/profile/4253422
Could SK's use Soulfire? Or did you just want to carry it around?
Honestly? I can't remember if the class restriction was in the game back then (circa 2002). I definitely re-did the quest chain using an extremely low-level paladin to get the weapon for that character, too, and used the SK to kill Lucan since I was already KOS with the Freeport guards. So I definitely had it on like a level 6 pally, and one that probably got rendered unusable after a patch on the SK.