
I am gonna love you by the end of this I think... And considering the fact that I already loved you for the RE Sarevok encounter it will probably approach something like worship. Seriously, I say feel free to tinker as you like, that seemed perfect to me.
As for Imoen, I'm not sure she hates Sarevok, but she would definitely poke at the whole thing which could irritate him or the PC. I actually can't see her leaving the party because of it now that I really think about it, but I can see her being curious and a little confused as to why in the Nine Hells the PC would even be attracted to him. I see her leaving if the PC is cruel in her answers to Imoen's questioning. Jaheira on the other hand... Hell hath no fury like that of a woman's or somesuch... And Jaheira... Well I think it will be hard to keep her if he is being romanced especially since she considers him such an abomination of nature.
A thought for Jaheira though it is rather harsh, then again Jaheira is a harsh woman, in the Longer Road if you are failing at redeeming Irenicus she leaves you. Maybe the same thing with the Sarevok romance? Like she'll tolerate him in the group if he's evil, but if you're romancing him and he's evil she abandons you. If you redeem him she will remain but otherwise no? Just a thought. I would understand why people wouldn't like this since she's quite the popular character but like I said just a thought.