You can pull out the rotor, but it requires a lot of force.

To get the magnets in the neutral position, you'll have to remove magnets and clips. You'll see that the clips have a nook that fits in a slot in the can. And that that slot has 2 brothers Now the nook will be in a lot on the side. By using the one in the middle, you will have put the magnets in neutral position.

To upgrade the motor to RW capabilities.
Using a strong glue- araldite was one of the choises- to keep the magnets in place.
Remove the fan.
Weld the front plate.

And keep in mind, overvolting to 24V will cook the motor, unless you have a massive reduction ratio.