It's a hard one to answer because your might need to reload a good deal.
Orin will take either Halsin or Lae'zel - whichever you have highest approval with. So you need to have high approval with one of the two.
I don't know if any modder has made a save editor that will allow you modify stats.
You can force the abduction by entering the sewers on the trail of the Emperor's old hideout - that will tell you if you have high enough approval.
Wish I could give a better answer - I would use Larian's feedback page they might be able send you a modified save file.
Edit: I was able to save both Yenna, Grub and Lae'zel but I had to pass a difficult persuasion check to save Lae'zel
