Harvey,

In absence of true gold foil, there are crossover foils that come very close in appearance, and adhere to leather very well.

The small Kingsley machine you own can be used to place single color logos on plastic namebadges. Multiple colors are possible, but the registration is more hassle than it's worth, for a short run.

David "The Stunt Engraver" Lavaneri
DGL Engraving
Port Hueneme, CA