These could probably work off you can put a bend in them.
https://www.sjscycles.co.uk/carriers-racks/thorn-4mm-stainless-steel-carrier-fittings-18cm-long/
Or? https://youtu.be/xFgprenQ7lI
Very smart. Would love to have a workshop and bits of metal etc, & welding gear and the skills of course !
@Chaley started
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These could probably work off you can put a bend in them.
https://www.sjscycles.co.uk/carriers-racks/thorn-4mm-stainless-steel-carrier-fittings-18cm-long/