I have the Petzl Micro, I think it’s called, it’s open-able on one side of the swivel and a tight eye on the other side, has a rubber grommet inside, holds a carabiner in place pretty tight.
I used to use it on my Cinch lanyard adjuster on a hip D. Haven’t seen it in a while, probably at the bottom of the gear bag, should put it on my rope grab.
Never had a problem with it loosening, it’s nice. I wouldn’t mind the Open swivel on a bridge.