Thank you for tapping this Ask an Expert resource to ask about your training materials. Overall, your examples are correct. I have attached a DOCX file that includes slightly different highlighting than yours as well as commentary (accessed under the Review tab in WORD).
You may consider including an example item (let's call it item #99) that is all Nemeth material and occurs following an item that ends in UEB and another item that begins with Nemeth material. In such an example item, the opening Nemeth Code indicator would best be placed following the item identifier (99.), and Nemeth mode would be left in effect through the end of item #99 and through item identifier 100. This could serve to reinforce your well-stated point that in linear math, nothing gets between an item identifier and its margin.
Thank you again for sharing your process.