Your idea is interesting. I do agree that the area indicated by green should be removed and that the walls could be rearranged to make it less awkward, but I think the spike should stay. Rearranged and slowed down a bit to make them easier to avoid, but still there, as they make Sardon's more unique and it adds sort of a gimmick. The door's position is up to how the room is redesigned, so that would be a variable thing.