The issue with latching onto it with something like the MEV-2 is that the LEM, if it's still in orbit, is almost certainly tumbling. That makes an automated intercept / latching-onto non-trivial, to say the least.
I wonder how feasible it would be to surround it with a coil of wire carrying a strong electric current, to slow its rotation via magnetic induction?
You might be able to harpoon it with a wound-up yoyo on a stick.