I'm neither a twin mum, nor a mum who's had cholestasis. However, I know of someone who lost twins to this and have friends who's babies were fine (in the end), but were delivered early.
So it's ended up being something I've read up a fair bit on and when I saw read, I mean the original research papers when I could access them, or reviews of the literature otherwise.
I'm speaking from memory now, but I don't recall anything that even vague conclusions could be drawm from regarding multiple pregnancies, most studies of were smallish anyway and with multiples being more likely to be born early for other reasons, that my result in less poor outcomes if nothing was done.
The interuterine death rate seems to sit around the point where the consequences of the large numbers of babies that have to be delivered early to save one baby are quite similar in some ways of measuring (though not strict mortality) to the complications to babies due to early delivery and mothers due to increased c-section rate. Also, the death rate is barely any larger than the death rate at that gestational age anyway, though there does seem to be enough information to determine that the death is due to the cholestasis, even though there isn't a good theory on how the cholestasis causes interuterine death.
Of all pregnancy related conditions, it's one I find particularly scary, medications don't fix it (though some help both with outcomes and symptoms), any monitoring other than constant monitoring of foetal heart rate doesn't predict it, and even then from first sign to death is short, so needs a fast emergency c-section to prevent.
So personally, based on the current information available, I'd definitely want to deliver at 37 weeks and possibly earlier, but that is a personal choice, which wouldn't be right for every woman and if a woman makes an educated choice, that should be respected. What does bother me is doctors who rely on serial liver enzyme tests and if they don't get worse hold off from delivering, when as yet, as far as I can tell, there isn't any evidence to support any reduced risk in these cases.
As for delivery if you decide to do it early, I'd try induction if you are a candidate, but I'd want continuous monitoring from the moment I entered the hospital, due to the sudden nature of the foetal demise. I've had a sucessful early induction for other reasons and although I got monitored more than a postdates induction, it was not continuous until the pitocin was started.