I agree with BC on that one.
I would never feed in a separate container. Not because of any reason other than it does not make sense to me, based on the snakes' needs, and to me that is paramount.
And it is a numbers game. Keeping more than one BP and there are many that if handled the day of feeding will not hit, let alone being transported to and from a holding tub, being FORCED into hunt mode without a hide (ambush predator? What's that?), and then while still in hunt mode (they can stay there for a long time after feeding) being picked up by a potential predator that also smells like food.
Too many variables that do not make sense to me.
Bruce