Might it be worth a shot to leave the snoot in acetone/nail polish for a short while?
It'll get rid of the paint if there is any left, and maybe soften up the glue? From there you could use a scalpel or some of those thin scissors to loosen it up?
The only over thing I can think of is getting a super big magnet and trying to use the magnetic force to pull out the pony's magnet?