I've both cleaned multiple times and changed the plugs on my 6er.
The only thing that needs doing is removal of the fuel tank.
And then reconnecting the main + reserve fuel hoses.
Yes I do have large hands, the only tricky plug is the nr3? (3rd from the nearside) Which happens to be just below the reg/rec.
I don't use a socket wrench for that though, well not the entire wrench.
Just the spark plug bit - the end that attaches to the actual socket wrench - without using the wrench.
And simply twisting it with my fingers to tighten/loosen.
Then take some bluetac and put it at the end of the spark plug bit, and fish out the plugs.