I am just opening up this stub to note down some useful links to articles and software I have tried during the Mac Burnet Tape restoration project.
This software allows extraction of VMS files on a windows machine from a Tape dump - Still working out how to dump.
http://software.reinhardt.nu/index_vmsbackup.html
http://www.softdevlabs.com/downloads.html
https://www.veritas.com/support/en_US/article.100026689
https://archive.org/search?query=quantum+tape&and[]=mediatype%3A"software"
https://www.quantum.com/en/service-support/downloads-and-firmware/sdlt600/#