Ah, I see my last entry was, indeed, missing the 12. Sorry about that!
I'm so excited to see you were successful with the last entry. It's a mystery why the en dash itself is behaving that way on your system and I can't replicate it on mine. But any number of hidden elements could be causing that. I'm happy to see that Option 3 is behaving perfectly, and we can just toss Option 2 into the elusive unsolved mystery pile LOL.
Meanwhile, changing the display is easy-ish, but exact the process depends on what's going on in your glossary. Can you elaborate on that for me? Are ALL of your en dash entries clustered together in your glossary in one continuous run, or are they scattered in several different spots?