The method described in the link is basically it.
You can, if you wish, put all these steps in a script and even reset serial number fields as well. That, at least makes the data import a one click operation--useful for cases where you may do this more than once. Just make sure you use the "matching field names" option for aligning fields if you script this or the addition/deletion of fields can tragically misalign your fields during a scripted import.
Oh well. Thanks for your quick response on this
A better solution would be nice. I've just about finished watching over 100,000 records import into an updated file myself.