You're going through all of Rebel Moby's stuff in the wiki, right? There is no substitute for his suggestions combined with some proper tools. Soak with Kano Kroil or a 50/60 mix of ATF and acetone penetrant, proper motorcycle flywheel holder ($25 on flea-bay) and an impact (in reverse!) should bust it loose. Don't hesitate to give it a nudge with a hammer and chisel if needed. Get the aftermarket hex replacement nut in your basket at treats--no more Novi nuts!. Keep at it, man. Mobys are worth the trouble.