I don't know if anyone has done this but no doubt it is doable,
but you would deprive yourself the opportunity to inspect all the fun things under that cover.
I haven't changed the oil in the clutch case yet but the manual says to loosen the case screws and let the oil run out then retighten the screws, could one pull off the whole case cover , drill and tap for a drain screw and not have to deal with the mess, I suspect there is not enough meat to drill and tap, how about drill, insert plug with nut and gasket on the inside of the case and remove drain screw from plug? Has anyone tried this?
Elk