OK,Definately worth making sure the heated bearing didn't move during the hot powder coating process...There could be some coating behind stopping it though,then you would heat,tap it out ,clean the shit out ,tap it back home properly.
Only use the oven if you can't budge the bearing with slightly more force when done at room temp.Use a socket or tube or whatever to press on the edge of the bearing outer ring that also is smaller in diameter to the bearing housing in the shell as you call it.The noise when you hit it will either not change 'cause it's home already or it will next hit when it arrives or has arrived.The hits(taps with a hammer)get bigger as you progress and as you get the feel and sound of what's going on progressing the bearing home.
The "on the piss" reassembly is odd.Any force to correct this on assembly is not good.
Don't bother with the freezer if this assembly was not disturbed.Its the different thermal expansions you are exploiting to allow tight fits to be looser when you use this technique.
Yeh,always more trouble than you think but that's how we learn.This I have found in life is the most important thing.How much trouble(effort)do I need to exert to do what I want...Then,ultimately,you get a pro to do it but hold them to it cause they're only half arsed human...as well.,just take your time ,be a perfectionist,and use you're common sense....It'll be worth it for several reasons...