Change Primary Groups for multiple users in Active Directory

Looking to change the primary group for most but all of the users within AD.  I use ADMODIFY all the time not but unfortunately it does not offer a change primary group option.  I know that generally it's not the best thing to do but our helpdesk software application has a user sync feature that requires the primary group to be something other than Domain Users because MS does not allow applications to query the Domain Users.  Since I need to make this change for 600 users I'm looking for an easy way.
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