Kevin, Any thoughts from SW Motech on building a set of symmetrical racks for the S10? My DL 1000 has the twin silencers so the asymmetrical racks are something new to me. Granted you would have a gap between the inside of the right case and the bike, but this "gap", could be utilized by attaching a flat Pelican box, tool tube, flat spare gas cell or bottle(s), etc.
This would fill in the gap yet still allows for a more symmetrical look from the rear. When so mounted, a pelican case would be essentially "secured", from theft or unauthorized access. Of course the side case would have to be removed to access the Pelican, but the contents of the Pelican would be for occasional access items like tools, Rolex watches, Hope diamonds, Halloween masks, etc. Same would apply for a tool tube, tire plugger, spare fuel, etc.
Twisted Throttle could come up with some nice bolt on options (bottle straps, etc.), to "up sell", various cases, too!