This is what I did. I paid my son a small amount per drive to disassemble and remove the platters. Mostly so he could work with his hands and see the inside of a computer. We also hooked it up to power once the cover was off, which was kinda fun for him to see too.
Side note, I have a "ball" of drive magnets (with the corner brackets still attached) about the size of a basketball. I was trying to decide if I'm going to mess with removing the brackets or just toss the lot in the trash. LOL.