Not really answering your post, but just now noticing that you have a name for your Henry Dustin Euphonium (Junior). I like it that you name your horns. I think I have only named my Adams E3, and my wife suggested the name. It is Nellie Bell. Haven't used the name much, but that is her name, none the less.
I have an old baritone that has pretty much been through the wringer. My band director bought it I think at an estate sale for like $10, so that tells you about the horn. But it is truly neat. At our home we just left in South Dakota, we put it atop a wooden CD case that was about 4-5 feet tall. It looked good there.
At a restaurant we used to go to, they had a big overhead chandelier type thing and they attached all kinds of instruments to that. That was pretty cool. And I have seen single horns simply mounted to a particular wall in a home. Kind of like how a music store displays guitars. If you did this, you might surround the horn with pictures of you and the horn together in action, or just the horn and just you or any combination. Make it a themed wall. You sound clever, go for it!