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I use similar to these.
They’re not adjustable at all but sit down flush with the top of your handlebar and weigh nothing. They’re a nice alternative to the Hirschi head-unit grab and keep you UCI compliant on your ride to Lidl.
They use a clamp like a Kalloy uno stem faceplate. The threaded bit in the carbon is flakey so only torque them to ~ 3nm (I think) and go slow, back and forth, small quarter-turns between the two bolts. Then they’re fine.
Does AliExpress do decent (maybe carbon?) clip on bars? Thinking more J bend than S as I'd use for comfort/extra position on long rides rather than speed and TTing but happy to be swayed either way by somebody who has more clue than I do!