OH! How about something sick and twisted? Like an optional component that expands the initial CI torture scene that allows the PC to choose who their party was in BG? Obviously, Imoen has to survive, but Minsc and Jahiera don't (I know they have a ton of content). Literally, I've spent almost every playthrough of BG2 with half of my party filled because it seems like shit to dump Minsc and Jahiera after they were captured with you, tortured, and have their own motives for revenge.
The PC could pick their four comrades from BG and choose their two favorites. Irenicus would then torture and murder the two favorites the PC chose to "unleash his power" and the other two would end up in the cages. Or, the PC could choose to have the two cages empty so they aren't guilted into taking Minsc and Jaheira along for the whole ride.