Do you have a welder, any welder...!?!?
ussually they just come off just by welding on them, don't ask me why, it works.
but if that is not the case just weld any piece of metal as a bridge in between the two sides of the races (on the metal oviuslly, just cut a piece of anything and weld it one) and then you will have a surface to push aka hammer the S^^t out of it.
oviuslly heating the hub help to expend the aluminum too.
Wanted: worn, ugly, cheap motorcycle cover for a big GS 1200