Try this trick I've found first.
Keep a bucket of ice cubes close by.
Hold cubes on the axle while you heat the hubs. (you're going to use alot of them)
The cold should keep the axle from expanding while the hub opens up.
I've had to do this on stubborn flywheels more than once.
I doubt this will work if a 12 ton press didn't do it, but worth a shot before you go cutting up your axle.
NOTE: I assume you looked for signs the previous owner altered something like pinning (roll pin) or spot welding the hubs on?
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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