so I would clip the rockbros on the adapter then to the bar ?Ortliebs QL3 ftting version will fit thicker bars but not cheap also the QL2.1 fitting will fit up to 12mm dia I believe both come with inserts to suit differing bars.
Also Carrdice have their own qr system.
This might do the trick and a possible cheap remedy ?
https://www.carradice.co.uk/products/accessories/pannier-hook-adapter-bar-single
Thanks for clarifyingThe Carradice is for converting you existing rack in to something that might accept your pannier.
The adapter clips on you over sized rack bar and then the panniers fit on the adapters bar, how the bottom of the pannier attaches is another issue. It isn't designed to replace your current fitting .
With a lot of quick release type panniers most rely on a bespoke rack or an adapter kit to attach them.