Unless you needed to respawn the quest mob through the fight as part of the effect, you probably could have saved yourself some time by using some of the new quest commands that let you adjust an NPC in almost any way you could want. Using quest::modifynpcstat(), you can adjust almost any NPC stat, which means very dynamic events are possible from a single boss that doesn't have to repop to change forms. You can also use quest::npcrace/gender/size/texture() to modify the looks to any look you want. The only thing I think that can't be changed on the fly now that is important is the name of the NPC.
Here is the wiki explaining those commands. You may already know about this, but if not, it is very helpful and more current than any of the other stuff like the Lexicon or the sticky post in the quest sections:
http://www.eqemulator.net/wiki/wikka...=QuestTutorial
BTW, your script looks like fun. We have a couple similar ones on Storm Haven. Some of them are pretty complex.