Since you have all the pieces, you could make a drawing (I’m a draftsman by trade and would be happy to lend my services if you wanted to send it to me).

After that, I’d take a crack at silver solder. It may just hold for as little as you’d be shooting it. As far as that goes, I work with a guy that’s a crack welder. We could do that too.
He’s a fellow gun guy and would love the opportunity to help out too.

Let me know!