The single player companions might be existent and ready to be picked up somewhere else in multiplayer, too. Or it might be possible to link previous answers into a vector that, together with character origins, determine which opinions he will express in the future. These opinions must have been arranged within a similar net of causality/consistency in the first place, ofc. This isn't easy and it will restrict how Larian can develop their characters and I would not recommend it, but with lots of effort it might be a possibility.
