I used a little variation on another answer (apologies for partial plagiarism) ...
svn propget --xml -R svn:externals https://myserver/myrepo > results.xml
and then executed the results through XPath using something like ...
//properties/target[contains(./property,'https://myserver/myrepo/mysearchpath')]/@path
This gave me a short list containing all the links.
The longest part was expecting a query that takes literally hours in our repository. Not sure if this can be improved.
Krayol
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