Woody's Wheel Works can probably make something up, at a price. The Super Tenere uses a different ABS sensor ring than past Yamaha bikes, but I don't know if it's the same as the '13/14 FJR. If it is, you might be able to swap the FJR's cast wheel to the Super Ten. You would need to verify brake rotor spacing and may need some custom wheel spacers, but that's not a big deal. The wheel itself would be spendy though, considering the relative new-ness of that Generation of FJRs.
In relation to the OP comment of wanting better handling on tar, it begs the question of what's the handling issue you have with the bike in stock trim? It is a 600 lb adventure touring bike, not a sport bike. But it's not that much of a dog to ride briskly.