Update links in Google Docs to point to new location

[pete]

A dept at one of our schools have (some time ago) moved from individual Google Drives shares to a Google Shared Drive so permissions can be more sanely applied.

 

However, they neglected to mention an intricate web of inter-document links that point back to the old individual Google Drive shares. Those links work for most existing staff, but for any new staff they're broken (you need to request permission).

 

Assuming appropriate permissions to the new and old locations, has anyone come across a way to update the links in bulk / flag up where a needed file doesn't exist in the Google Shared Drive?