I have always fed my snakes in their tank or tub, and I HIGHLY suggest you do so with your ball python.
Your causing stress before and after their feeding and risking a possible regurgitation that is just not needed. There really isn't any good reason to move him from his enclosure to eat.

Ball pythons prefer to prowl and not to be moved to a completely different and new area is not going to make him want to eat. It's stressful.