How can I separate the wheel hubs from the drums?

If I am understanding you and Halifaxhops correctly-
removing the lug studs by driving them out ( or pressing them out on a press or hammer)
The hub should separate easier that way.
Don't be afraid to send a marked up picture so we are on the same page if you can.
I forget parts availability or application is not the same in all places.
Also wear safety glasses if heating or pressing.
Okay that was a "Dad moment."
LOL!
Joe