Don't know if I'm too late to the party, but... lost wax casting and silicone rubber moulds make for a pretty straightforward way of making silver jewellery.

If you can make a master copy of what you want your klit pin to be in a three dimentional form out of anything - almost anything at all - it can be metal, wood, wax*, 3D printed etcetera. And if you can find a casting company in your local area who also do finishing on single run items (soldering on a hinged pin and locking hasp, and papering and polishing) then that's all you need to produce whatever you want.

They'll take your master and produce a silicone mould - you can do this yourself, but unless you have a vaccum chamber to degass the mixed silicone you'll almost certianly get bubbles on the surface of your master - cut open the mould and poduce a wax copy (you don't have a wax injector and don't want to buy one... trust me), this goes onto a tree with many other waxes, gets invested (and again degassed), cured, the wax gets burnt out, and the void left is filled with silver (or other metal of your choice)

You're in the USoA I see, so should have plenty of choice of casters, it's finding ones that will do finishing for a single item that will be more dificult, though many will recomend companys that will do finishing - the latter is the case with the casting company I use. But I do all my own finishing anyway so that makes no diference to me.

*If you can produce exactly what you want in wax and you're really confident about the finish and deatil you're able to achieve then you can have them cast directly from your wax, saving you the cost of a silicone mould (for me it's about £35 for a kilt pin sized cold mould)