Set Entity ID numbering on Existing Records

Hello,

When we first imported our customer database into NetSuite many customer entity records were created with an entity id of the customer's name.  For example:

entityid = "John Doe"

...instead of...

entityid = "123456"

We have since enabled autonumbering but there are still a large number of records that don't have a number assigned as their entity ID.

What I would like to do is find a way to automatically update any customer record that fits this criteria with a entity ID number based on the current numbering convention.

Currently whenever we save a customer record that fits the criteria above it just populates the name in place of the ID number then the Company Name (for company records) or Last, First Name (for individual records).