I'd say soft solder the parts together.

It takes much less heat and is strong enough for anything sporran related.
(After all, British shotguns have the barrels soft-soldered together, and They don't fall apart!)
Soft solder can be had that contains no lead, if this is a worry. I think it is called silver bearing solder, or some such.
Soft soldering can be done very easily with a soldering iron, or a small propane torch. All you need is a decent flux, the type like a grease is good....don't use the solder with the "resin core", most times this doesn't want to work,..for me at any rate!

Best,
R.