it doesn't seem all that bad from here.. at least the tapered cone seems to be running true. Camera movement makes it hard to tell. Check it for runout with a dial indicator.
looks to me like the threaded end is tweaked a little and might be responsible for all of the crankshaft's wobble. Since the flywheel itself is cracked and probabaly twisted somewhat, it's own independent wobble mean it's not very informative watching that wheel spin.
gonna be a touchy situation straightening out the threaded end of the crankshaft ..
Mark it's point of maximum runout.. Then a lucky whack or two with a hammer on a piece of hardwood might bend it back.. (Assuming there's no runout on the tapered part, support the tapered part so there's no chance of bending that at the same time.)
Maybe leverage on a piece of steel pipe slipped over the threads will do it.. Going too far will be easy and this requires a light, careful touch..
If a new, straight flywheel spins ok, you were sucessful.
When mounted, keyway lined up, the cracked flywheel should confirm in what direction you need to go.. but a dial indicator is much preferred.