I'd happily trade K for I&A in camp.
Maybe formally make K a camp caster, unable to trust himself to leave camp (and would be attacked on sight outside of camp anyway).
His training could also aid in rolls to attempt domination of the Elder brain.
Who is the I in I&A? I assume A is Astarion?
Isobel & Aylin, I assume. Presumably for an evil playthrough (do Isobel & Aylin come to your camp if you play evil? I thought at least one would be dead...)
Sorry, I didn't even realise, you meant Aylin, stupid of me

. I'm honest, I never would give up my Selunite power couple, but it would make sense on an evil playthrough, as I stated above.