Duplicate Source Lines From Data Source

Hello there,

In an Import WF profile, I would like to duplicate all rows where the UD3 member is different than None. In the duplicated row, I need to change the UD3 POV to 'None'

I know this can be done easily through 'Derivative Rules', however I am trying to do so in the Data Source through a 'Complex Expression' or 'Business Rule'.
PS: This is bad practice since source data should NOT be altered to keep Audit trails, but in my case I am just exploring possible options