The problem is that the weight rests on your shoulder. The top line jacket from Klim has a harness that secures the jacket to your body and hence anything you carry in the jacket is weighed through the harness. It also has a pocket for a hydration bladder. Kriega or Camelbak is much more convenient. The rapid inflation of the collar would push the shoulder straps to one side. I wouldn't worry about bladder as by that time the jacket inflates your kit will be fucked anyway.
But if I ask myself what will I be more likely to use, the Camelbak or inflation vest then the answer is the Camelbak and hence it has a preference above an inflatable vest. Invest in some training if you think the risk of becoming a cropper is too much. There is only so much protective kit will do for you.