There's nothing you can do. The Void Seeker and Iona Farley works that way. You cannot take it out, even with Neuraclean. You can probably put them in the Annex via Houserules, and do dinner arrange events with them. That's +6 to +7 Affection, to counter the -5.
You are the only one who can answer that.
It looks like there's a bug in 0.8.4.3 that clobbers Iona's (and probably The Void Seeker's) Detached trait -- specifically in the adding of new skills under the
"/* Important! Reset new traits and skills here */" comment , e.g.:
<<set _npc.traitemo to 0>>
From what I can tell it fires off for everyone. Iona in my current game is lacking the trait, and the game was started under 0.8.4.1 and I think I got her there. Later I updated to 0.8.4.3, skipping 0.8.4.2.