The best way I can imagine, to make that work, would be to use an extra nut on each post, to securely capture your wire and guarantee a connection.
IF your posts didn’t come with 2 nuts per (AND I remember correctly); 8mm-1.00, jam nuts are what you’d need.
Were I going to pursue that idea; if needed, I’d confirm the size/pitch, before buying anything online. Most hardware stores have gauges/sizing boards available, if you don’t have a way of determining the specs, for yourself.
Hard as these nuts are to find: brass or copper would still be the preferred material,