Well, don't flame me alot for these two mods:
1) Mounted an R1150GS luggage rack to the grab rails- long screws and a small bit of drilling to the rack got all four holes lined up and solidly torqued. I can use it flat or put the BMW 35 liter Top Case on there. It is useful for camping trips on the go to and return trip. In between, while we are out sporting, the case serves as a really effective beer cooler with ready refreshment when we return.
2) Tried the R1150R Speedster Screen (blue tint, bigger than fly screen/smaller than sport screen) and again, lined up the four mounting holes with those on the screen. Had to purchase longer M5 bolts and spacers, but it works. Unfortunately, the buffeting around the side is worse than with the baby screen and the wind hits my chinbar rather than my neck. And I've been told it looks a little round peggish and square holish.
So functional and possible but not recommended.