No way would I waive closing argument. Make the record. Push the envelope until the judge flips out and threatens contempt, or even delivers. Some hills are worth dying on. To prevent the establishment of fedbeast kangaroo court precedents is one of those hills.
I think if I were the attorney and the judge asked if I had any closing arguments, I would have simply stated out loud that “it would be a waste of time since you completely stifled our ability to put on a legitimate defense.”