Even with popular big 4 Jap bikes, you go with what's available made for the bike. I've seen one expensive skid plate, but Vs. 650 is a street bike for most people. There are a couple of dual purpose riders and one is even for sale here. I think other than SW, Hepco Becker (HB) is the most popular engine guard since it also covers the radiator too.
I also have a SW centerstand and it has a wide steel bar across the bottom of the engine which may act as a mini-skid plate. It is added to increase strength in materials to lift the bike up at the centerstand point. I also put my Redlight magnet on it near the street to help recognize me at redlights: for the most part it works with the $20 magnet part.
When I saw your post, I did not know what you were selling and still don't. If you find it, post it so we can all see. SW may make a skid plate for it. Good luck.