From the article: "The couple, who work with a range of trees including willow, oak and ash, said there were currently "a few dozen" growing pieces in their orchard, including stools, benches and "the odd chandelier" in progress."
Your comment made me think of those helix-shaped bamboos from IKEA. While this is of course on a whole different level, it does suggest some kind of shaping is possible for bamboo as well. And it wouldn't take decades...