Making your own wire inlay tools is a good idea. That way you can match the sweep of scrolls, so you can work in tight spaces, or more expansive areas, depending on much wire you want to put in the stock. Those small brass, and sometimes German silver, nails are available at most hardware stores, and lumber yards. A homemade tool can easily be made to change the small round head into a countersunk head. It’s just a scrap of steel with a proper sized hole drilled through it, and the lightly countersunk. You just drop a nail into it, while the block is clamped in a vise, and wack the head with a smooth faced hammer.
Hungry Horse