I have a ball that I got as a pre-production sample from Gary Murphy (Murph's) who you would know well if you had a Concours in the recent past.
Gary also aspires to support the FJR community.
The left bar mount simply bothers the heck out of me - doesn't matter if it's the mirror hole mount or the better EZ-504 or RAM-B-309 series that uses the control pod screws to mount the ball (or balls).
I REALLY like the idea of the Euro navigator mount, even though it seems to retail at about US$100 or so. The placement looks excellent and there are no possible issues with hitting the windscreen. It also leaves the sides free for possible other Farkles (though at this time, aside from Cruise control and electrical switches, there's isn't anything I immedediately need those points for - the GMRS radio will be underseat with an external antenna and wired to the Autocom.
To this end, Gary and I have been discussing making up a mount just like Yamaha's for the '06.