Hi, I am pretty new here so I thought I would make my first contribution. I haven't seen anything similar but if I am mistaken you all have my apologies. In my organization disabled user and computer accounts are moved to a separate OU. After a period of time they can be deleted. Since they are disabled in bulk they can be deleted in bulk. But I am sure everyone knows that group membership is a pain.
This little script will connect to a specific OU and remove group membership from all users and computers. (the groups 'Domain users' or 'Domain computers' are not removed)