I've created the staging site as you've requested; credentials are hidden below.
FYI ... the corruption from the attack has created duplicates of everything within the database. If you would like me to send you a sql dump file, just let me know. You'll see that all of the Joomla content articles, sppagebuilder pages, etc., has been duplicated. Since the sql tables no longer have unique id in the ID column, records cannot be deleted as normal in phpMyAdmin.
Current selection does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available.
I was able to run ALTER TABLE commands, adding a new column with auto_increment which then allowed me to remove the duplicate record rows. The duplication corruption runs so deep that I was unable to remove duplicates without creating new issues (e.g., no longer being able to view pages in backend of SPPageBuilder while logged in as administrator).
The staging site I've provided has the original Joomla 6 files and database from after the critical security vulnerability attack in SP Page Builder (v6.1.1).
I appreciate your time and efforts with this situation.