Silver, Nickel & Stainless steel..

[Rotsco]

I've been tasked to try to make these hair pins (with as low a price point as possible), and I'm struggling.
I'm using Sterling Silver for the bezel, Nickel Silver for the base, and Stainless Steel rod for the pins.

I can get the bezel onto the base without issue, but soldering the pins on is a nightmare.
I either need so much heat the Silver bezel warps and melts, or the pins just don't solder.

I even tried JB weld steel resin to attach the pins, but it A: looked horrible & B: Broke.

I'm pretty sure this wouldn't be a hard ask if I was working with Silver, but it would make the pieces beyond a workable cost.

So Silver, to Nickel Silver, to Stainless steel. Am I dreaming in thinking this will ever work?
Can anyone else see some alternatives that I'm not seeing?

Any and all suggestions or guidance appreciated.. If I had hair I'd be pulling it out.