If that will fit the front wheel on the R1200 it will also fit the front wheel on the F800.
I like the idea of a dual use tool. The price is a bit much, but.
Bu the real draw back for me is I like to torque the front wheel. And I don't see how I could do that with that tool.
I use a two sided tool, and a socket is placed onto the other side.
Also, the Hayabusa and probably quite a few other bikes use that size front wheel axle tool.