@GossiTheDog I wonder if AD supports importing data from an exported list. It's been years, but the last time I ran a Windows domain the AD mmc would let you export all sorts of data to a plain text tile. I actually used this in conjunction with a python script I wrote once to ping every computer object in our OU on a schedule so I could look for patterns over time and remove stale objects from the previous admins.
Anyway, I wonder if you could export and import user account stuff this way.