I found those pole systems right after making this post and they're exactly what I'm looking for, but about three times my budget. It's a shame medical supply companies charge so much, but I guess that's to be expected. Have you seen anything similar to the Cuzzi in a slightly shorter form factor? I've only found ones that are 60" tall, and nothing below around $550.
That backpack would be the one, except I don't have a UPS to make it truly mobile. Also, trying to keep duct tape out of it.