just take the end off and leave the magnatised multipole rotor inside the laminated body so it acts as a keeper
(I have read with some motors, the rotor will loose some of its magnetism if you remove it !)
as for being easy to rewire the coils It depends on the stepper motor
and how the coils are connected
The one motor I replace the connecting wires had a printed circuit board that would of made it easy as all the ends of the coils was soldered to the PCB
if its like this picture found on the web
it does not look like its that easy
John
PS