Ingenious.
When I had to remove mine I did it with the engine in the frame, bike in gear and a piece of 2x4 through the rear wheel resting on the swingarm.
I also drove the hammered in part back out a bit since I was replacing the nut anyway.
--Edit--
Just checked your pics and that is not a C10 clutch. Just about everything looks different to those in the manual and those I've worked on.