Your description seems like it would fit the Scavenger World and/or Low Culture, High Tech tropes, where Athasians can find and use artifacts from the Blue or Green Ages, they just don’t have the level of knowledge to build their own (or repair one if it broke).
Sufficiently Advanced Bamboo Technology would be illustrated by things like the Pristine Tower, The Dark Lens, The Crimson Monolith (assuming you have these things in your Dark Sun) - artifacts of immense power which most Athasians not only could not build, but would not even have an inkling how to operate or even its purpose.
Curious you mention Eberron - I am just about to ask (in a different thread) how difficult it might be to adapt Eberron adventures to Dark Sun…
Addendum: @objulen you’ve probably already seen this post on Tech Levels in Dark Sun but in case you haven’t: Tech Levels on Dark Sun?