Without rivet heads, is it really any different than solid core wire of appropriate thickness?
That aside, and against my own reservations, I've got some of these in my Aliexpress cart currently when I get around to clearing it out next
(in case the listing goes, title is "1 Black Jar Boxed Bar Design 0.5mm Thickness Rivets Studs Gold Plated Metallic Japanese Style 3D Nail Art Decoration Accessories")
I have absolutely no idea if they are solid, brass, copper, or maybe even plastic, but for $2 I figure it's worth a look.