I'm pretty sure that style of bannister won't pass code in the US anymore. Can't have spaces big enough for a kid to stick their head through.

These are just for external Juliette balconies that are not operable (cannot be accessed).

Brass in the elements will tarnish.

https://www.indital.com/Rosette-Solid-Brass-3-7-8-Dia-Not-Double-Faced-p/160-h-n.htm

IMO a plain weld at the intersection is perferable.

Here's another option with a circle at the intersection

https://www.indital.com/Ring-15-32-X-1-4-Matl-3-15-16-Rnd-p/157-1.htm

You can also consider just a plain style for the balconies.

So incredibly helpful, thank you!