Here are similar holsters from pocketholster.com. Although I have no experience with their products, the image shows the style, the 4 across the top, without the hinged, fake zipper top. Rather than screws, the anti-print panel on mine is fastened with snaps, making it simple and quick to convert.
If you look around, I'm sure others make a similar style. Hedly Holsters makes a good one, but I think their anti-print panel is riveted on, making it less versatile, IMO. Perhaps they could alter that and use snaps or screws upon request.