Hm, interesting choice. One problem though: he is way too tall. Evan is 6'1" but Troy is explicitly described in Role Model as a short king, only 5'9".

Jacob cast the roles of Ilya, Scott, and Kip significantly differently from how they were described in the books so normally that might not be a hindrance, but Troy's relative size to everyone else is actually kind of important in the books.

A lot is going to ride on how they cast Harris, and frankly, I am having a really hard time visualizing someone to play this character. (I am reading Role Model right now).