In your case it's gone way beyond something like a moss pole. Unless you want that attaching directly to your wall, I'd invest in either a large untreated cedar plank that it can attach to, or a large piece of decorative freshwater driftwood. Your plant has an inherent weakness in that it's basically what is called a butt cut. It's a new shoot that formed off an old stump and grew into a new plant. Where it attaches to the old meristem is an area of weakness that may eventually snap if it gets too heavy. It won't kill your plant, your plant has already rooted but it would let it fall over.
One thing that would help besides the large support would be to take all the long adventitious roots going everywhere and burying the ends in the pot. You will also need a bigger pot, you may as well address that when you install the support
