Do NOT split the box from the bell housing to work on the clutch.
It is fiddly possible – but not easy – to remove gearbox/bell housing assembly from a Légère without removing the engine as well.
You will need to disconnect the throttle linkage to the carb and remove the rear engine mounting and battery to enable the front of the engine to be raised to achieve the necessary clearance at the cradle.
In my experience, if you have the facilty to remove the engine and gearbox as an assembly and then separate them, that is the best approach.
B…..