I think it's a great idea, I like it. I'm not too sure if you can make a quest that reloads the boss area multiple times, but I do know there is coding that can make Kondrieu always spawn, the same way you can make regular rare enemies spawn indefinently (such as the modified TTF that every enemy in Forest was a Torr, and every enemy in Caves was a Mil). I've also seen people make multiple of any boss at the same time (most commonly known quest is Military Strikes Back, where you fight two Gol Dragons at the same time). Imagine fighting Milion, Kond, and Sham-wow at the same time. Now THAT would be fun. In my opinion XD