Tired of your flexy old bars, but don't want to use an awful boat anchor quill adapter or swap your fork for a rare 1" threadless one? Years ago, I daydreamed of a solution incorporating the upper half of the headset, but
joejack951 went and made one. Then he made more, and you can have one yourself. It's glorious. Comes in silver or black.
https://www.innicycle.com/