When I got that challenge via PQI, I was literally treating it as an achievement. Something similar to what the Hardcore runners do via the 100% and stuff like that. When I figured out it was possible (I did a preempt run similar but had to cast only 1 spell, breaking the PQI.) It only took 2 more runs and it basically worked itself out.
I still haven't successfully had a run in the Library or Naga City, but I will casually attempt stuff here and there, which makes the PQI very good especially from my point of view. It allows testing and pushes capabilities within the game. Shoot, I even remember when I was trying to get Ding! in Hobbler's Hold for 2 weeks. Yeah I didn't earn any gold in the end for it, but it was still a good learning ground for me back then.