If your going to do a lot of wheels over the long term, why not look at some form of a lathe setup where you can cut off the rubber, I think I've seen something similar for cutting off the tread on a tire prior to retreading.
Otherwise, I would suggest a decent amount of heat to break the bond between the metal and the rubber. You could put it in a fire pit, but I'm pretty sure the neighbors aren't going to like that.
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