I've been doing this one for the last few years, first on my XT500 and recently on the XR650. The 'C' route is definately doable on an adventure tourer. Last year there were several GS1200s, including one with a sidecar!
http://www.loosescrew.dualsportbc.com/
No, I will not attempt it on Stanley! :icon_rolleyes: (I lack the testicular fortitude to even think of it)