I have moved nitida Baggesoms Gold, not as high but at least as wide, and they transplanted well. But, the normal nitida is really a small plant, isn't it? Yours seem a bit big. As much rootball as possible, cut hard back.....I would cut by half or more.....and I would do it next month. Water well. I would fleece too, not because of frost but to help protect against desiccating winds. Worth trying and I expect it to be ok