[KensRedZed]

I dropped a body into a jar of Super Clean degreaser to remove the paint and found it loosened all the glued parts that were epoxied in place.

Try removing the tire and drop the wheels in Super Clean for 3-days. It will remove the paint from the insert. But might also loosen the glue bond.

If the insert is press fit? Leo's way is the only way.

Best of luck! A 25-year old project finally under way? Cool.