Thanks, urst -- I appreciate you being willing to take a look -- I've attached the save.
And I'm sure you're right -- it's no biggie and doing no harm to my game. My game runs fine, and the only reason I ever noticed this was from the recurring messages in the Papyrus log. It's just my obsessive-compulsive side!
I've got LOTS of mods in there (ENB, textures, DynDOLOD, animations, HDT, SL, etc.), and I've generally been able to keep them working together with Enderal (I think?). The overhead and potential complications from this one little script is nothing compared to all the other crap I've piled in. But still, knowing it's hanging around has been a minor thorn in the side for me, and my efforts to fix it have all been ineffective.
I think I finished that quest about 300 savegames ago. Given that it's not causing any apparent trouble, it's not really worth any great effort to fix. But all the same, if you know a simple way kill it (without breaking something and causing true trouble), I'd be grateful.
And I'm grateful to this community for supporting us as we play what may be the greatest mod of any game of all time!