Remove the finger grooves with files, or a Dremel tool and sanding drums. Finish with sandpaper to a smooth, no visible scratches finish. To give it a "finished" appearance, have the front strap area lightly beadblasted.
You can also give it a home-done matted finish. Get a 1/4 inch diameter rod. Checker the end with a checkering file, or a triangular needle fine. Hold the punch just off the surface and LIGHTLY tap the punch with a small hammer. As you rapidly tap the punch, rotate it back and forth, and move it over the surface. This will give a stippled-like finish. Experiment to find how hard to tap the hammer.
I use hardened punches to matt my steel frames.