Yeah, I think it's totally possible for Larian to do something like that to make weighted money feasible.
I just think it would be a gigantic waste of Larian's time and resources compared to just making weightless money.
I completely disagree. Giving the player the choice to go rogue or become part of the game world is a great way to add intrinsic and extrinsic rewards. It also adds more play time per developer hour than a standard campaign. This is why so many RPG games have been implementing it.