update7:
It really can work :-)
Thanks K9TURRENT for the photo and the "make".
update6:
It is glued. The glue can be broken with heat. (soldering iron, fire, torch)
Details are discussed in the english ender-3 facebook group:https://m.facebook.com/groups/439904499779979?view=permalink&id=595702564200171
Maybe a combination of this pulley puller wit heat could do the job.
If the pulley puller does not weaken or melt ;)
update5:
It does not work.
:-)
From the beginning we all were not sure if it could work... and it seems that the pulley cannot be pulled off from the shaft.
It is heat shrinked or glued. Investigations are ongoing if there is a way without a dremel ;-)
So.... sorry for any hopes that I might have created and now destroyed...
But creality is to blame.
update4:
added version with 6mm bottom thickness because it should fit.
More temperature than usual for better bonding. "Perimeters only" should be best.
5mm bottom version broke at a test at german user from facebook group.
update3:
added version…

Improved Pulley Puller Gear Extractor https://www.thingiverse.com/thing:3230712
No heating required.
Tested on two stepper motors with success.