You can get stainless wire/rod (welding rod may be a simple source, just crack off the flux) and bend the pin fairly easily. Might not be quite as neat bends as a factory made one, but it will function.
With practice bending eventually you can make them look as good as the factory ones.
Helps to drill holes for each bend in plywood
. and affix a base line stopper block.
Insert dowel for the big loop, make that bend. Then insert a steel
pin to make each bend as you get to it.
I bend a LOT of spring steel
(music wire) and titanium up to 5/16 inch diameter.