Don't know if it helps, but I added a crossbar to my Magura (fat middle 22mm at the ends) bar. The crossbar actually comes from Touratech that was designed for the R1200GS, but it fits nicely even with my Acerbis handguards mounts. A dealer offered me a solution where they can put the barend weights INSIDE the Acerbis guards. I opted not to go for it as a) I don't think it will work with the oil reservoir and mirror mounts, b) I think the crossbar actually helps a bit in minimizing vibrations, c) I now let the bike warm up a bit before I take off so this helps smoothen the bike, and c) the bike gets smoother the more I ride.