Notice that the bar mounting allows for no adjustment at all. There's no telling how many adjustment kits the Pirate has sold to K1200RS/GT owners indicating the need for that feature, and now it starts all over once again.
Fact is, it's difficult to imagine how an aftermarket supplier could even produce something that would work. Honest to god, you really have to wonder about the little doo-fahs at BMW that come up with irrational ideas like this one.
Check those instrument needles and dials (poor copies of those on my 1963 Corvette), they're not any more attractive than the swayback bars.