Your scheme oughta work, if the clutch disk tabs (or the basket fingers, if you wrap around them) survive the consequent strap tightening from the applied torque.
I think special clutch-holder tools exist; a strap wrench might work. Regardless I firmly believe getting your hands on a 1/2" drive air or electric impact wrench would be most useful in removing the clutch hub nut.
Just curious; why remove the clutch hub nut? Disk maintenance/replacement is possible by removing clutch bolts only, IIRC.
Regardless, best of luck with your project.
Last edited by Damocles; 07-08-2018 at 10:56 AM.