Completed successfully*!
* WARNING: before gluing the halves together after replacement, I popped it back into the case to see if the light responded. When I pulled it out, I only had the top half and the magnet in the case was strong enough to hold down the bottom half and break the ZIF! However, somehow, it still appears to work perfectly fine! This is the left bud. I know others have said theirs continued to work after breaking the ZIF, but I can't tell a difference in function or sound after some initial testing. All's well that ends well?
Also, I found I needed to remove the ZIF in order to grip the batteries with needle nose pliers and wiggle them loose of the stubborn glue. No issues removing/replacing the ZIF connection, just be sure the lock is open.