Suppose bounding box is in option. The problem I have with a bounding box is that when you have non rectangular shape as per my sketch below there might be something inside the bounding box but outside the block body. This could probably be overcome by using draw order though and putting the item above the bounding box, But then what if the block needs to cover something. the bounding box is part of the block. So how do you make it that goes under the block but over the bounding box.
BOUNDING BOX.PNG. Think there should be an option to use a bounding box or up until block body for the wipe out. This should resolve the issue for both instances