Welcome, Samarah!
A third read-through is serious dedication, especially if you’re in Crossroads of Twilight again. I always find that WoT rewards rereads because there are so many little details and bits of foreshadowing that are easy to miss the first time.
Your Arafell/Yellow Ajah character idea fits the setting really well too. Growing up that close to the Blight would certainly give someone a strong reason to value Healing.
And I’m with you on wishing the show had spent a little more time letting Emond’s Field be the audience’s doorway into the world. That slower introduction is part of what made the beginning of the books feel so effective.