Re polarizing ceramic magnets.

This may be an easy one for the right person but for me up to this point I have yet to ever do it on purpose.

Can the ceramic magnets in servo motors be re polarized, have their polar orientations moved, simply by brute force from a stronger electromagnetic field?

Reason being I have a large DC servo motor I would like to change from an 8 pole to a 4 pole. The ceramic magnets that make up the 8 poles are four single ceramic magnets with both poles on the face. I want to re polarize them to be one pole on each face.

My thoughts are to turn the end bell that the brushes are mounted on to the correct spot that puts the rotor is in a magnetic stall then rewire the brushes for the four pole configuration and then just hit each pole with a several hundred amps from my DC welder a few times to force one of the poles on face of each magnet to change its polarity so that each magnet has only one large pole facing the rotor and not two smaller poles.

Will this work or will I be more likely to have the rotors intense magnetic field just rip the ceramic magnets off the outer frame? The rotor windings and stators are robustly built so they can take several hundred amps for a short time with out damage. My concern is that the ceramic magnets may either pull off or not fully re polarize and I will end up with a junk motor.

Any thoughts on how servo motors get their magnets re energized while being refurbished and can that method also be used to change how the magnets pole orientations are setting as well?