You can take the clip out of the top and pull the switch assembly out. Just take a small screwdriver of pick to get it out.
Then find a way to push the cell out the bottom.(dowel, broomstick, or something) You can neutralize the alkaline with vinegar or lemon juice and light scrubbing. Then rinse it and reassemble. The aluminum will probably be pitted but that is only superficial. Hopefully the switch assembly is still good.
I was able save a D20 for a friend this way who didn't want to try his hand with the battery company.
Good luck.