So, I've done some thinking.

Given that I'm still playing through the games for the first time and don't really have the firmest grasp of how the Witcher universe works yet, I think I'm going to bow out in favor of the people that do. That and I also want to avoid "Superhero syndrome" from being so used to playing a Witcher (and one of the most badass, at that) that being someone below that in the same universe would feel unsatisfying.

Good luck to everyone involved!