PervasiveSQL 11.3 and VDF19

OLD.BTR has 120 fields
NEW.BTR is exact same filedef as OLD except there is a pre-pended new field 1 totaling 121 fields
Task is to copy all records from OLD to NEW, programmatically adding each new field 1 value
Files are huge and a BPO takes 10-hours! SQL to the rescue, but....
Can’t use SQLEXEC INSERT OLD to NEW because filedefs aren’t identical (new field 1 !!)
+ Listing out all field names in statement would be terrible!
+ we have to do this with 13 files!

Thoughts on the best (easy to code, fast execution) SQL method to do this?