This was announced by Rich Greene about a month ago, but may still be of interest to you. OCLC has relaxed its validation requirements for batch loading of records into the OCLC database:
“After April 13, only severe errors will prevent records from being added to WorldCat via batch. Records with minor errors will be added.
“…some records added via batch after April 13 may contain fill characters in the OCLC fixed field or in fields 006 or 007.”
Here’s the complete announcement.