Justification for unrecruitable is that she's not a Hunter in the show. Justification for being backup is, fine, I'll say it: I'm the Nurse / backup Doctor, and she wants to go to medical school.
Horrible, absolutely horrible justification.
Me and rex already talked about this in the mason PM and I figured you were going to go that with the justification for unrecruitable. It doesn't click with me in the slightest though, just because no one would recruit her doesn't mean she is unrecruitable. She is literally powerless lol. Makes way more sense for that character to just be vanilla. And no amount of medical training in the word would be equivalent to the ability that the raw healing doctors in this show can do in a fraction of the time, so the doctor back up justification is equally as non-sensical lol.
Nice try dude.