In that case, heating it up should be fine, just remove the bearings and any labels from the can before you break out the blowtorch. Once the epoxy is soft, you should be able to just push out the windings without too much effort- have fire extinguisher handy though...
I have the same type of rotor, but it came with 1/8" shaft. Here is the deal, the magnet is too strong and it causes a higher Io current which have shown it will cause motors to over heat. With that in mind, that rotor assembly will work best with a lower Kv motor of around 1000-1300 to keep the Io low. Hacker and Lehner uses a lower strength magnet (Different material as well), but it works out great. Not always using a stronger mgnet will make it better.