If it was a "steel" or iron.. you heat one side with a rosebud, throw water onto it. It'll draw up.. I used to do shafts like that.
Yeah.. good thing you don't live next door.. I got one press 5hp, 3phase that explodes aluminum things till you learn not to put them in there. THE HSM-Metal meet inspired C-press manual one I dearly love.
Cooling warps, as does webs, different thicknesses, or leaving sand on one side in eager anticipation digging it out too quick?? used to be the auto rotors cast in Chattanooga Tn, had sand on one side where they shook them out? a hard-soft spot unless annealed and retempered. (learned this by cross drilling hot rod discs)
Hang in there friend, things, times are a changing.