We should seriously have a tool that a tool-changing 3D printer can use to do this.

Have the claw pick up an even smaller claw that picks up the bolts!

If you're willing to do a bit of loading and unloading labor(I know, it's a lot to ask) some people have been trying out simpler solutions to that problem: https://makerworld.com/en/models/982703-bolt-screw-separatio...