I miss playing with Jessi too. I don't know what kind of plans you have for Efaen, but try not to treat the poor thing too badly. I was think when Xevec finds out she's on board, try to get her to attempt to hang out on the bridge and be their eyes and ears. Just use Claxter as an excuse. I don't want it to look like I'm trying to use other characters to help them get together, because I honestly am not, and Xevec would probably not want them to genuinely be friends anyway.
Someone's bound to say that they can't trust her, but to Xevec, saying that she wants to help the rebels would put her at about the same level of trust that he has for anyone on board. Which is kind of depressing, but he's got issues he needs to deal with.