If none of the above works ,you might try this. warm the bike {run it}to operating temp ,it will help expand the plates.shut down,and tie the clutch to the handlebar {bungee works well}. get on,start it, and roll fast enough to engage 1st gear, and putz up and down the road, in gear getting on the throttle, then
backing off, {repeat several times} it should break free, this has worked for me on several differant bikes, I dont like to rock it backwards,because if your cam tensioner is loose, or worn
you might skip a tooth with the chain...........I learned the hard way........