For you guys wanting to design a frame mounted bash plate....have a look at what Touratech did for the Tiger955. They mounted theirs onto the frame at the same points as their crashbars mount at the front and the frame near the footpegs at the rear. So I think that might work on the 800s.
Also, there's an idea that the bash plate mounts to crashbars. That would need crashbars something like the SWmotech or Adventure Spec ones that bolt to the bike's frame so that any bash plate frame can be welded or bolted to the crashbars.
2002 black Tiger955i, 72000 miles and counting.
2012 black Tiger800XC, 32000 miles and counting.